Monitor stays Black after new graphics card

December 7, 2011 at 11:46:09
Specs: Windows 7, 2gb
Hi all,
I brought a new graphics card to put into my computer, but when i turn the computer on, the screen still stays black and the fan on the graphics card is on. I also don't hear any beeps from the computer. It is an AGP Card.

Graphics card:

Motherboard: 775VM800 -
Ram: 2GB
Power source: 400W


See More: Monitor stays Black after new graphics card

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December 7, 2011 at 12:46:02
Describe the exact steps you used to install it.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.

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December 7, 2011 at 12:57:35
Turned off computer
Took out old graphics card
Inserted new graphics card
Monitor stays black/Computer dosen't boot

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December 7, 2011 at 14:04:59
So you did NOT unplug the computer?

Try returning the original card back into the system to see if it then works.

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Related Solutions

December 7, 2011 at 14:07:43
"Power source: 400W"

Your power supply doesn't have enough wattage capacity.

Your video card has the Radeon HD 3450 video chipset.

ATI Radeon™ HD 3400 Series System Requirements


■Connection to 550 Watt (750 for CrossFire™) or greater power supply with two 2x3-pin PCIe® power connectors is required.

■Certified power supplies are strongly recommended. Refer to for a list of Certified products

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December 7, 2011 at 14:09:37
Yes i unplugged the computer

Are you sure because on the official graphics card website it dosen't say what power supply it needs and other customers have it running on 400w perfectly.

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December 7, 2011 at 15:29:35
ATI made the video chipset - the link in response 4 is to ATI's information.

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December 7, 2011 at 15:49:32
Oops - the info in response 4 is for the PCI-E X16 version of the HD 3450.

The AGP version requires less power.

Minimum of 300 Watt or greater power supply with one available 4 pin ATX supplementary power connector (Molex)

System Requirements: 300 Watt power supply


Did you plug in a suitable power connector from the power supply into the power socket on the video card - a larger 4 pin molex connector, the same connector as you use with an IDE hard drive or an IDE optical drive ?

Did you unplug the computer BEFORE you installed the card, and/or BEFORE you removed any existing AGP card ?

Did you have the new AGP card all the way down in it's slot, and was it's end bracket fastened to the case, BEFORE you restored AC power to the computer ?

AGP cards and AGP slots are easily damaged if the power supply was getting AC power to it at any time when you plug in or unplug the video card, even when the computer is not running

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December 7, 2011 at 16:34:56
Unplug computer before i installed card
Yes i did

So what do you say the problem would be?

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December 8, 2011 at 10:13:52
I tried everything,
-Disabling internal graphics
-Taking out my sound card
-Use different power cable
-Updated bios to latest version...

and still nothing... :S

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December 8, 2011 at 12:45:58
"Power source: 400W"

Is that the OUTPUT wattage ?
The wattage capacity you need to be concerned about is the max output capacity - how much input wattage it requires is always more because power supplies are not 100% efficient and that input wattage rating is not relevant regarding the requirements of a system with a particular video chipset on a card installed in a mboard slot.

Your two yes answers in response 8 are useless when I/we don't know what they're referring to.

There is no setting in the bios Setup of your mboard model (or any mboard model that has an AGP slot) that actually disables the onboard video. Only installing a video card in the AGP slot and having that video card being recognized by the mboard properly causes the bios to disable the onboard video.

However, if the video card in the AGP slot is not being recognized properly for whatever reason, that may not work properly.

Try removing the video card, connecting your monitor to the onboard video port, and attempting to boot the computer.
If the computer works fine that way, there is probably something wrong with the power supply, or a lot less likely with the video card, or with the AGP slot's circuits.

Try the video card with a different working system, if you can.

The power supply may be defective.
Try connecting a different power supply from a working system, if you can, that has at least a 300 watt output capacity.

"Updated bios to latest version."

That was probably completely un-necessary.

Flashing the bios to a different version usually DOES NOT automatically load the Cmos contents of the changed bios version. If the bios still has the Cmos contents of the original bios version the bios settings will probably NOT work properly.
To make sure the contents of the Cmos match the bios version, go into the bios Setup and load bios defaults, Save bios settings.

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December 8, 2011 at 13:00:50
I have a spare 300W power supply which i will use it to try and run it.
I updated the bios because it had a VGA update and i have alot more settings for AGP control in the bios.

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December 8, 2011 at 13:01:46
How did you manage to flash the BIOS if you had no video?

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December 8, 2011 at 13:20:20
I used internal graphics to disable it from device manager and then i used my other video card to update bios.

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December 8, 2011 at 13:56:45
Disabling the onboard video in the operating system has nothing to do with disabling the onboard video in the bios, and has nothing to do with whether the AGP card produces video while booting before the operating system loads.
If the other video card installed in the AGP slot works fine, then there's nothing wrong with the AGP slot's circuits on the mboard.

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December 8, 2011 at 14:08:45
When i connect the new graphics card the computer doesn't even boot so it produces absolutely no video.

The APG slot is working perfectly, i just don't know why the new graphics card doesn't want to let the computer boot.

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December 8, 2011 at 14:10:51
If one card works in the slot but the new one will not even allow the system to boot into BIOS let alone get to the operating system where driver issues arise, then you have to consider the possibility the new card is DOA out of the box. It has happened to me.

Goin' Fishin' (Some day)

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December 8, 2011 at 14:14:25
Or the second card draws too much current as discussed by tubesandwires above. Are you connecting the auxiliary power to the card?

Another possibility is that you are not fully seating the card. Are you able to lock the tang on the back end of the card? If not, then the card is not fully inserted.

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December 8, 2011 at 14:20:02
I'm connecting a molex connector straight from the power source into the card. The fan works and spins.

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December 8, 2011 at 14:22:43
Reread #17 above because I added an edit.

Also post the brand and model of your power supply.

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December 8, 2011 at 14:35:00
The card sits perfectly and locks into place.

This is my current power supply:

My spare power supply (havent tested on graphics card yet):

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December 8, 2011 at 14:35:17
The normal way is to remove the driver from the OS first then you power down and replace.

What happened when you put the old card back in?

Since the internal works then you might use it to diag the cards.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.

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December 8, 2011 at 14:40:29
The power supply link is useless. No brand to check.

Post the information off the label about the wattage for the +12V rail.

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December 8, 2011 at 14:53:54
The old card works perfectly straight away after i put it in
What do you mean by 'diag the cards'


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December 8, 2011 at 15:15:18
Both powersupplies have the same 15A output on +12V rail so there is no advantage of one over the other. The "current" one only rates a higher overall wattage rating by boosting amps on the 3.3v and 5v rails. Pointless deception.

Either the new graphics card is DOA or it is too much drain on the powersupply. My money is on DOA. The card should draw between 2 & 3 amps at peak load. Unless the rest of the system is loaded down with extra hard drives or other things loading up the 12V rail it should at least boot up.

Goin' Fishin' (Some day)

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December 8, 2011 at 15:25:07
So what should i do?

Ive only got 1 hard drive on the computer so there's hardly anything taking power, also my disk drive is disconnected

Should i try using the molex connector for external HDD and try using that as its power supply?

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December 8, 2011 at 15:51:52
Get the new graphics card tested in another machine to confirm whether or not it is dead.

Goin' Fishin' (Some day)

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December 8, 2011 at 16:33:11
All power supplies of the same output wattage capacity are not necessarily equal.
Both power supplies are el-cheapo models, which tend to have lower amperage ratings, or the max ratings are a lie.
Older power supplies tend to have more amperage at +5v which is not what is needed for modern video cards.

The AGP version of the HD 3450 requires a minimum PS of at least 300 watts AND at least 18A at +12v.
I can't make out what the amperage rating for +12v is in your first picture in response 23, but the second one does not produce enough amperage at +12v - a modern 300 watt PS probably does.

For that first example of a HD 3450 AGP card in response 7

....this PS was recommended:

It has two +12v output sections -

16A + 16A = 32 A at +12v

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December 8, 2011 at 17:02:37
How about this:

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December 8, 2011 at 17:54:14
You are shopping for junk. If the seller doesn't post the specs then most likely the PSU is not a quality unit. Doesn't seem to be expensive enough to be quality either. Buy from a legitimate online store.

The second link shows only 15A on the 12V rail. Not enough IMO.

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December 8, 2011 at 19:51:14
See if you can locate one of these in the UK:
They are 80% efficient and have only single 12Volt rails.

You have to be a little bit crazy to keep you from going insane.

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December 9, 2011 at 08:08:54
+12V 34A isn't enough?

So approximately how much do i need?

And should i get one with only single 12V rails?

And can i not connect a external power supply to the fan?

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December 9, 2011 at 09:52:04

Here are specs of psu i posted before at bottom of page

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December 9, 2011 at 09:56:47
Where do you get 34A@12V from. Refer to your links in #20 above.

I can't make out the specs from your first link and the second one is for a unit with only 15A@12V.

Your link in #32 above shows 22A on the +12V rail.

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December 9, 2011 at 10:01:53

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December 9, 2011 at 10:49:55
$15/16 US dollars is not enough money for a quality PSU, IMO. The input amperage is not stated in the specs but the specs are fudged anyway. The wattage of the 3 main rails adds up to 650W.

Going back to the beginning, that card comes with a low profile bracket. I assume you are using the correct bracket for your case?

Are you connecting the 4 pin molex 12V aux. power connector as required?

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December 9, 2011 at 10:54:20
Sorry can you explain about the 'low profile bracket' thing?

I'm connecting the molex connector from my current power supply inside the graphics card, fan spins but computer doesn't boot.

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December 9, 2011 at 11:19:15
The card you have may have come with 2 brackets, or just a low profile bracket to mount it into the case. Slimline cases require a low profile card. Most cards are the same in both the standard and low profile editions except for the height of the mounting bracket. Using the wrong type of bracket for your case will result in the card not seating properly. The low profile version is shorter. If you install a low profile card in a case that takes standard height cards the card will not seat correctly. Conversely, if you install a standard card in a case that requires low profile cards you will need to bend the bracket in order to install the hold down screw. This will also result in the card not seating correctly.

I brought this up because most cards and cases are standard but your card is sold in low profile configuration by at least one vendor.

Are you using the VGA or the DVI port on the card?

Did you enter the BIOS and change the graphics type to AGP from on board? That should NOT stop the card from running but sometimes does cause problems.

See the link below for a picture of the bracket.

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December 9, 2011 at 11:25:46
The metal part is long and has VGA, DVI and HDMI and fits perfectly onto the slot.

I have tried all slots.

My bios settings are set on PCI at the moment as i restored to factory settings. Ive tried AGP and PCI, i will take a pic of the card on the motherboard and a picture of my BIOS settings.

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December 9, 2011 at 11:42:32
What do you mean "I have tried all slots." You should only have one AGP slot. If you are installing a PCI card you need to disable the AGP in the BIOS.

Perhaps a dumb question but you are connecting your monitor to the new card? Look at the link below to see the difference between an AGP and PCI slot.

The Black slot at the top of your motherboard is your AGP slot.

You may be getting confused because your motherboard has integrated AGP graphics. That said, you could install a PCI type graphics card in on of the other slots. In that case you should disable the AGP integrated graphics.

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December 9, 2011 at 11:48:27
Ive tried all slots such as HDMI, VGA and DVI lol.

I know what it looks like im just wondering what shall i change in bios?

Or is it a power supply issue only?.

The AGP slots only handles 1.5V agp "1 AGP slot, supports 1.5V, 8X/4X AGP card" onto saying "Do NOT use a 3.3V AGP card on the AGP slot of this motherboard!
It may cause permanent damage!"

"Primary Graphics Adapter
This allows you to select [PCI] or [AGP] as the primary graphics adapter."
-Does this mean i can use a pci graphics card?


Thanks for all this info btw

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December 9, 2011 at 12:56:30
Don't change the bios.

Did you remove the driver from the OS when the old card was in there.

I get the feeling the card is bad.

1/3 of highway deaths are caused by drunks. The rest are by people who can't drive any better than a drunk.

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December 9, 2011 at 13:04:03
No i haven't removed the driver.

How do i find out if the card is 1.5v?

and since my Motherboard says PCI as primary graphics adapter can i use a PCI card?

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December 9, 2011 at 13:04:21
If you are using an AGP card in the AGP slot then you should use the AGP setting in the BIOS. So is the new card AGP?

Did you buy that AGP graphics card new? Do you know someone that has a compatible computer that you can try it out in?

HDMI, VGA and DVI are all external ports, not slots. Slots are on the motherboard.

I just went back to the top of this thread and saw something I missed before.

You had an add in graphics card installed before? What model and type is that card and why did you stop using it?

Try connecting to the integrated graphics without ANY add in graphics cards and see what happens then.

If that works then boot into the BIOS and view the voltages in the PC Health screen The 3.3V, 5V and 12V should all read with +- 5% of specs.

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December 9, 2011 at 13:17:11
Yes its been used before but its in very good condition and is working.

The graphics card im using currently is ATI Radeon 9550 / X1050 Series which is AGP with 319.5mb video ram. It works perfectly.

The integrated graphics also works and lets me use my computer just as normal just without windows aero support.

Ill take a pic of my bios cause ill need help with the settings and such.

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December 9, 2011 at 13:35:41
Bios main screen:

Health Screen:

Graphic card settings:

And apparantley i can use a PCI card to use as my graphics card, should i try this?

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December 9, 2011 at 14:44:14
You have primary graphics adapter set as PCI when you appear to be installing an AGP card. Change that setting to AGP and try again.

I still suspect the card is doa since you have not verified it works in another system

Goin' Fishin' (Some day)

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December 9, 2011 at 15:09:53
I tried changing it to AGP and still no difference.
Its only on PCI mode cause when i restored settings

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December 9, 2011 at 16:14:09
So to summarize all that has been said & done so far:

You have an old AGP card that worked in the system and still does when you re-install it.
You have onboard graphics that work if there is no AGP card in the slot.
Conclusion: There is nothing wrong with the motherboard
You have a "New" AGP card and when you put that one in the slot your system does not even boot.
You have a relatively low-end powersupply and an equally low-end spare.

Either the card is dead, or the powersupply cannot provide enough power to allow boot. Since any graphics card will display in basic VGA mode drawing minimal power until the operating system starts up ( when drivers kick in and the advanced more powerhungry card features are used), and yours will not even allow the system to begin to boot, the logical conclusion is that the card is faulty.

Where did this "new" card come from? It has not been available new for over a year so what is it's history?

Goin' Fishin' (Some day)

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December 10, 2011 at 10:38:07
I have contacted the seller and he states that the card is fully working, i have tried my lower wattage power supply which unfortunately made no difference.

Any suggestions?

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December 10, 2011 at 14:26:26
As suggested in #43 above, try the card in another working and compatible card or return the card.

How much did you pay for that card?

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December 10, 2011 at 14:32:05
"I have contacted the seller and he states that the card is fully working" He has your money and does not want to give it back.

Take it to a tech and get it tested.

Goin' Fishin' (Some day)

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December 10, 2011 at 15:47:07
Payed £35 for the card.

I have contacted the seller and he has agreed to help me to make it work. He is going to send what power supply he used when he was using the card.

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December 11, 2011 at 15:06:53
Going to buy a new PSU Which one is the best:


Or does anyone know another good PSU's under £15 that would work.


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December 11, 2011 at 15:36:42
You are not going to find a decent PSU for 15 pounds. You need to spend at least twice that.

What happened to the seller sending you a PSU? Too much money?

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December 11, 2011 at 16:38:57

That is a good quality powersupply. Costs almost twice what you paid for the suspect graphics card. Before you spend any more money on your system GET THE CARD TESTED. You only have the seller's word that it works.

Goin' Fishin' (Some day)

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December 11, 2011 at 17:24:08
Okay thanks guys, gonna get the card tested tomorrow hopefully.

My PSU is becoming loud so i need to buy a new one anyways.

Thanks guys! :)

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December 12, 2011 at 12:07:46
"The graphics card im using currently is ATI Radeon 9550 / X1050 Series which is AGP with 319.5mb video ram. It works perfectly."

Graphics cards that install in an AGP slot have an even multiple of 64 or 128 of ram on them - 319.5 mb doesn't make sense.

The amount of ram on the video card is shown in System Information.

( In the Start Search box in Vista or Windows 7 type: msinfo32 (click on OK or press Enter)

On the left side, open up Components - Display
The amount of ram is shown on the Adapter Ram line on the right side. )

Windows 7 has built in support for Radeon 9550/X1050

Both of them use a Radeon R300 core.
Radeon R300 series

The only difference seems to be the X1050 requires your system has a higher minimum power supply size.

ATI AMD Radeon™ 9550 DIAMOND Stealth S120 AGP 128MB DDR DVI & TV Out


Detailed specifications

System Requirements
Power Supply : 250 WATT

AMD Radeon X1050 AGP


System Requirements
300 watt or greater power supply

DIAMOND Stealth X1050 ATI AMD Radeon™ X1050 256MB AG

Detailed specifications

System Requirements
Power Supply : 300 WATT

Since the Radeon HD 3450 requires a 300 watt PS / 18A at +12v and your system doesn't work when that card is installed, assuming there's nothing wrong with the HD 3450 card, I suspect your other card is a Radeon 9550 rather than a X1050 video card, and the power supply does not have enough capacity to support the HD 3450 (or the X1050) video chipset.

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December 12, 2011 at 12:18:19
Wow thanks for the nice information!

So i need a new power supply overall?

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December 12, 2011 at 13:09:48
My usual stuff....

Don't buy an el-cheapo (in quality) PS.
See response 3 in this:

I no longer recommend Cooler Master, AOpen, or Sparkle power supplies.
I'm now downgrading Thermaltake to middle of the road.
Antec has two lines of PSs - the better line has a longer warranty for the same or similar capacity - the other line is more towards middle of the road.
AMD has a list of Certified (tested and found to be good quality) PSs:

Your power supply must have at least the minimum capacity required to support a system with the graphics card you are using installed, or the max graphics card you might install in the future.
(Onboard video - video built into the mboard - IS NOT A CARD ! )
If that info is not in the ad for the video card, you can go to the video card maker's web site and look up the specs for the model - often under system requirements - the minimum PS wattage, and, more important, the minimum amperage the PS must supply at 12v is stated. If you don't find that, any card with the same video chipset including any letters after the model number has very similar minimum PS requirements. Some power supplies have two or more +12v ratings - in that case, add those ratings to determine the total +12v current capacity.

If you're a gamer...
In most if not all cases, the max capacity rating of the PS is an intermittent rating. It's recommended that you do not load your PS to any more that 80% of that rating if you are going to be using something that puts a constant load on it, such as playing a recent game for hours on end. In that case, you multiply the min capacity stated for the system with the particular video chipset on the card by 1.25 to find the min. capacity of the PS you should have.

Richard59's example power supply in response 55 - note that it has a 5 year warranty.

" My PSU is becoming loud so i need to buy a new one anyways."

The noise is probably coming from the PS fan's bearings. You can easily replace the fan for it, but in this case you probably need a PS with more capacity in any case.

El-cheapo power supplies tend to have a fan that has two cheap sleeve bearings, rather than better bearings - those bearings are likely to get worn much sooner as time goes by to the point that too much friction is being generated in them, and when that happens they tend to cause screeching and/or rattling noises, most likely to be heard when you first start up the computer after it has sat unused for many hours.
You can replace the fan with one of the same size that has at least two ball bearings (if you don't wait until the PS has been damaged from it overheating, becaise the fan is not spinning fast enough or not spinning at all). If you use a 3 wire case fan as a replacement, you can connect it to aany spare 3 pin fan header on the mboard and then have the option of monitoring the PS fan's rpm in the computers bios, or by using a hardware monitoring program in Windows.

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December 12, 2011 at 13:35:08
Okay thanks, do you know any good psu's that are cheap?

Is this good:



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December 12, 2011 at 14:08:19
Thermaltake is a reputable brand and the price seems reasonable for a used unit.
That one meets the 18Amps/12V requirement. Let us know how the testing works out on the graphics card.

Goin' Fishin' (Some day)

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December 12, 2011 at 15:20:15
I said this in response 59...

"I'm now downgrading Thermaltake to middle of the road."

.....because I noticed some reviews where different PS brands were tested and the Thermaltake ones didn't do as well as other brands.
The other brands - Aopen, Sparkle, Cooler Master - I no longer recommend because they tend to develop failing electrolytic capacitors, or in the case of cheaper Cooler Master models, they may have only a one year warranty, and/or a fan with cheap sleeve bearings that can fail to spin and as a result can overheat and ruin the PS in less than two years.

The prices of good quality PSs vary depending on where you are. Any PS that meets or exceeds the (don't buy an elcheapo in quality) requirements I pointed to in response 59 will do - the longer the warranty, the better.
Personally I prefer buying Enermax PSs because I can buy them locally for cheaper than similar Antec models.
If you buy locally, the price can be cheaper than buying off the web if you must pay shipping as well when you buy off the web.
Smaller local places that have lots of parts and that build custom computers are more likely to have lower prices.

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December 13, 2011 at 16:59:18
In all honesty go out and extend your paper route to get a little more money and buy something recent rather than used garbage

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December 16, 2011 at 14:43:04
Got powersupply, same issue, trying to return ideo card to sender unless anyone knows any other ways

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December 16, 2011 at 15:42:30
How many times did I advise you to get the card tested. You know without doubt that the rest of your system is in good working order. The card is the only thing that does not work. End of story.

Goin' Fishin' (Some day)

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December 16, 2011 at 17:32:03
As did I also suggest you test the card.

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December 29, 2011 at 06:20:24
If the card is a dedicated, you need to plug the monitor into the graphics card.


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