When I switch on the PC there is no Bios screen showing up

May 29, 2012 at 06:04:26
Specs: Windows XP
My PC just stopped on its own . When I swiitch it on The screen doesnt show anything. The screen is black. I tried the RAM it was fine. When I test the motherboard current,I get the current flow. I tried the power supply, it is well working in another PC board. I now dont know what to do..I suspect a cpu...may is it damaged or it is the mother board?

See More: When I switch on the PC there is no Bios screen showing up

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#1
May 29, 2012 at 06:06:19
does anyone have help

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#2
May 29, 2012 at 12:17:59
Have you tried a different monitor?

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#3
May 29, 2012 at 13:14:51
Tell us the make and model of your brand name system, or if you have a generic desktop system, the make and model of the mboard.

The model, sometimes the make, of a mboard in a generic desktop system is usually printed on the mboard's surface in obvious larger characters, often between the slots.

The specific model of a brand name system is often shown on a label on the outside of the case somewhere, or it can often be determined by going to the brand name's web site and loading a program they have available, if Windows is still working, on the subject computer.
......

"I tried the power supply, it is well working in another PC board."

Good move. That proves it works fine with another mboard, but there may be one or more reasons it doesn't work with the subject mboard.

What is the make and model of the power supply ?

What is it's max (output) wattage rating ?
....

If you are using a graphics card installed in a mboard slot for your video, what is the make and model of it, or at least, which specific video chipset does it have ?

If the max (output) wattage rating of the power supply is more than 50 watts less than the minimum capacity recommended for a system with a video card installed with the particular video chipset it has, the power supply may work fine at first, but it's likely it will eventually be damaged by it being overloaded too much of the time when that video card is installed. If the PS has been damaged by that situation, the PS may eventually no longer be able to boot the system when that video card is installed. If your mboard has onboard video (a video adapter built into the mboard), try removing the AC power to the system, remove the video card, connect your monitor to a port for the onboard video, restore AC power, try booting the computer. The PS may still be able to boot the system when you're using that onboard video.
........

It's extremely RARE for ram that worked fine in the same mboard to go "BAD" , and it's a lot more rare for more than one ram module to go "BAD" at the same time.

Usually there's absolutely nothing wrong with the ram that worked fine previously in the same mboard, UNLESS it's been damaged by some external event, such as by power spikes or surges caused by a power failure event, or by someone having done something they shouldn't have done with the ram, or by someone having NOT removed the AC power to the power supply when plugging in or unplugging anything inside the desktop case AT ALL TIMES.

However, it's common for ram to sometimes develop a poor connection in it's slot over time(s), or for someone to not have seated it properly

See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:
http://www.computing.net/hardware/w...

Sometimes, especially if a ram slot was empty for a long time then had ram installed in it, the slot may have crap in it that needs to be blown out of it (DO NOT use a vaccuum cleaner to do that).

One of the LEAST likely things is the CPU has failed

Failing power supplies are common.

If you eliminate the power supply as the cause of your problem, and if cleaning off the contacts and re-seating the ram that worked fine previously didn't help, probably the most common reason for the system not working is something on the mboard has become defective or has been damaged.

Rarely, especially if you have a NVidia main chipset, one of the chips in the main chipset may have become defective over time.

Some mboards develop this problem - electrolytic capacitors were installed on them that were not properly made, and they fail eventually - the mboard manufacturer didn't know they were improperly made at the time the mboard was made.

Open up your case and examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

What to look for, mboard symptoms, example pictures:
http://www.badcaps.net/pages.php?vid=5
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.
http://www.badcaps.net/

Pictures of blown capacitors, other components, power supplies, fried Athlon cpus, etc.:
http://www.halfdone.com/Personal/Jo...


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Related Solutions

#4
May 31, 2012 at 00:15:52
thanks, my mother board has writings like these: Gigabyte: GA-G31M-S2L, FSB1333 DDRII800 and in between the slots I have : SATAII PCI DUO CHANNEL DDR800PCI
It is like that. When I tried wth another Screen and another Power supply I got the same non respons from BIOS, it couldnt show up. The Power Supply I was using has a maximum wattage of 450W. I still need help

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#5
May 31, 2012 at 00:48:45
Normally when I get nothing on the monitor at boot up I suspect the power supply simply because for the past several years I seem to have been encountered with a rash of failures. It would have appeared you have ruled that out.

How long had you been using that power supply? Had you installed any new and or additional hardware lately?

Not seeing the bios or setup screen normally rules out a bad hard drive for me because the system bios will come up without a hard drive installed.
This leaves us with the motherboard or cpu. Unless you have another cpu to put in your board or another board you can put your cpu in these are very hard to test. I agree with Tubesandwires that this normally would not be the cpu but the one time this happened to me on one of my machines it was. I found out by replacing the board at cost and then having to replace the cpu.

Likely


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#6
May 31, 2012 at 07:57:51
Do the fans and hard drive(s) spin; do the power and hd activity leds light up ?


"Gigabyte: GA-G31M-S2L"

GA-G31M-S2L (rev. 1.0) (home support page)
http://www.gigabyte.com/products/pr...

There's only 1 revision of it.

Manual - English - Date 2008/11/24

Your mboard may be about that old, or up to about a year newer than that.


Specs
http://www.gigabyte.com/products/pr...

Excerpts:

Chipset
1.North Bridge: IntelĀ® G31 Express Chipset
2.South Bridge: IntelĀ® ICH7

Expansion Slots
1.1 x PCI Express x16 slot
2.1 x PCI Express x1 slot
3.2 x PCI slots
.......

Your mboard has onboard video - a video adapter built into the mboard - and a PCI-E X16 slot.

As I said above....

"If you are using a graphics card installed in a mboard slot for your video, what is the make and model of it, or at least, which specific video chipset does it have ?"


If you DO have a video card in the PCI-E X16 slot.....

"The Power Supply I was using has a maximum wattage of 450W. "

Which one ? The original one or the other one you tried ?

Some video chipsets require the system has a a power supply that has a recommended 500 watt or greater capacity.
Some PSs have an inadequate +12v max amperage rating for the wattage capacity in comparison to the average for the capacity. You supplying the make and model of the original PS would be useful regarding that.

In any case, it's common for PSs to malfunction over time, or to not be able to handle their max ratings over time, in which case the PS may work fine when it has a lesser load on it. .

"If the PS has been damaged ....." ".....the PS may eventually no longer be able to boot the system when that video card is installed. If your mboard has onboard video (a video adapter built into the mboard), try removing the AC power to the system, remove the video card, connect your monitor to a port for the onboard video, restore AC power, try booting the computer. The PS may still be able to boot the system when you're using that onboard video. "
...........

Have you tried cleaning the contacts on the ram and re-seating it ?
If NO, DO THAT !

Manual - English - Date 2008/11/24

Your mboard may be about that old, or up to about a year newer than that.

I have experienced at least one Gigabyte mboard that developed failing capacitors over time, and have heard of many others.

Have you examined the capacitors on the mboard to see if any show evidence of failure ?
If NO, DO THAT !

See response 3 above.
..........

Incompatible ram can cause the mboard to not boot at all, no mboard beeps.

Ram working fine in a different mboard proves it works fine in the other mboard, but it doesn't necessarily prove it is compatible with using it in your mboard.

Did you change which ram you have installed just before this problem first happened ?

Were you fiddling with whatever ram just before this first happened ?


Has there been a power failure event that happened before this first happened ?

Did you clean the interior of the computer case by using a vacuum cleaner before this first happened ?


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#7
June 6, 2012 at 00:35:44
I noticed as well that the CPU part is over heating though the CPU fan is working as usual

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#8
June 6, 2012 at 07:09:41
That's the first time you've mentioned that a fan spins.

Does the power led light up ?
Does the hard drive activity led light up ?
Do (does) the hard drive(s) spin ?
Are you hearing the normal beep you usually hear while booting the computer that indicates the bios has passed the POST ?

If you had video, you could check the current temps in the bios to see if the CPU is overheating, but otherwise it's normal for the CPU heat sink to get warm after a while, even warm enough that you can't keep a finger on it for long, and most mboards will shut off automatically if the CPU temp goes above a certain temp and in that case you can't burn out the CPU.

You haven't answered any of my questions in response 6, or made comments about other things I said in that.

I have no idea whether you're using a video card installed in a mboard slot.

If you are, try removing the AC power to the case, unplugging the video card, connecting your monitior to the onboard video port, restoring AC power, and booting the computer. .


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#9
June 12, 2012 at 01:26:09
Sorry that I couldnt have access to internet, so I couldnt answer the questions. I did the following test:
1. I tested power using a brand new power supply with power range of over 450W-
-still no bios, no beep, no mother board lead light, but cpu fan working properly
2. I tested my power suplly in another PC board, it worked perfectly.
3. I tested the RAMs, they are working in another board perfectly.
4. I removed the CPU itself and replaced it with a working one from another board
-same problem, no bios.
5. I tested my cpu in another mboard,it worked quite well
6. So Iam afraid I dont know what to do. Should I assume its the MBOARD itself misbehaving? or dead? The mboard has all cards entegrated. ie. VGA, Ethernet,Sound card etc. I dont used auxilliary cards....
I need help ....

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#10
June 12, 2012 at 18:20:19
"Sorry that I couldnt have access to internet, so I couldnt answer the questions."

It doesn't matter to me whether you respond right away, but you could have answered more questions in response 4, 7, and 9 and you didn't !

The more questions you answer, the more details you provide, the more comments you make about what we've said, the more likely we can figure out what you problem is sooner.
.....

Has there been a power failure event since the system last worked fine all the time ?

Do you check the mboard for failing capacitors ?
If NO, DO THAT !
See the last part of response 3.

" ......the mboard has all cards entegrated. ie. VGA, Ethernet,Sound card etc. I dont used auxilliary cards...."

The term CARD is frequently mis-used.
A device that is built into the mboard that cannot be removed is a device adapter but IT'S NOT A CARD !
A device card - a device on a CARD - is on a physical board that installs in a mboard slot, and it can be installed in or removed from the slot !

"1. I tested power using a brand new power supply with power range of over 450W-
- still no bios, no beep, no mother board lead light, but cpu fan working properly"

".....cpu fan working properly"

Good.

What do you mean by "mother board lead light" ?

Is the power led and the hard drive activity led lighting up on the front of the case ?

Is the hard drive spinning ?

Most mboards have an led on the mboard surface that lights up when the mboard is receiving DC power from the power supply, whether the computer is running or not, as long as the power supply is receiving live AC power.
Is that lighting up ?
If NO, your mboard may be damaged.

"2. I tested my power suplly in another PC board, it worked perfectly."

Good - so your problem computer's PS is okay.

"3. I tested the RAMs, they are working in another board perfectly."

When ram works in another mboard that proves it works in the other mboard, but it does not necessarily prove it should work in the mboard of the system that's not working. Ram that is compatible with one mboard may NOT be compatible with a different mboard.
However, if it's the SAME ram that was in your mboard when your system was working fine, and that's what you're using in the problem system, then your problem is not caused by the ram.

If you're NOT sure it's the same ram....

Make sure you have a speaker or speakers or the equivalent connected to the mboard so you can hear mboard beeps (see your mboard manual if you need to).
Remove the AC power to the case/power supply.
Remove all the ram.
Restore AC power.
Try to boot.
If nothing else is wrong, you will get no video but you will hear a pattern of beeps that indicate no ram is installed, or a ram problem.
E.g. for an Award bios or a bios based on one, that's often a beep of about a half second, silence for a half second, a beep of about a half second, silence for a half second, continuously.
.....

"4. I removed the CPU itself and replaced it with a working one from another board
-same problem, no bios.
5. I tested my cpu in another mboard,it worked quite well"

A CPU that works in one mboard won't necessarily work in another mboard, however when it's the same CPU that works in the other mboard that was installed in the problem mboard then there's nothing wrong with the CPU.
A defective CPU is one of the LEAST likely things that causes a system to NOT boot normally.


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