pc boots, no video

July 24, 2009 at 10:24:45
Specs: Windows XP
Hello PC Peoples

Okay.. I've been doing some browsing and I see that more than a couple of people are having a problem like mine, but I cant find a solution.

Alright.. I built this pc somewhere around 2 years ago and about six months ago this problem started.

I dont think anything significant happened to cause it..i.e. no driver changes, no new parts, etc..

Anywho, i know my pc is booting cause i see my keyboard light up, then my mouse, then i can hear windows loading..however, i get no response from my monitor for any of it. I use an Asus A8N sli premium mobo and i believe that 5 beeps during post is a VGA related error. The accompanying voice message says, "System failed VGA test".

At first i would get 3 options, it seemed.. The pc could boot with 1 beep, which means the VGA test passed according to asus post codes or i would get the 5 beep message and no visuals, or the pc would just sit for hours (yes hours) without doing anything after turning it on. Now, however, I get the 5 beeps every time without fail and no response from the monitor.

I feel it's important to note that when this pc decided to boot with the single beep, i'd notice absolutely no difference in performance. I could play left 4 dead, for example, on high settings for days on end without a reboot.

it's been 2 years since i built this and i honestly cant remember some brand names. here's what i can remember.

ASUS A8N SLI Premium mobo 939
anthlon 64 3800? i think x2
2 1gb ddr ram sticks
nvidia geforce 7900 gs 480M extreme GPU
some kinda cd/dvd burner drive and my hard drive
also, i'm sure i'm not running anything less than a 400 watt PSU, but no more than 450w

alright, since the pc boots without visuals, i'm assuming that the CPU/Mobo/Ram are all fine? I mean, i've used each stick of ram independantly and having put one in the wrong slot before, i'm now aware that my mobo can detect and POST memory errors should they occur.

I went out on a limb and bought a new GPU and after plugging it in, i still got the same 5 beeps and no visuals.

I stripped my pc down to bare bones, CPU/Mobo/1stick of ram and GPU and i still get the 5 beeps and no visuals.. i'm at a loss and 2 steps shy of absolute insanity..

Also, i've tested the monitor and it works fine on another rig, but that's all i've been able to test as my friend loaned his pc to his out-of-state gf. :(

Can anyone help, please?

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July 24, 2009 at 10:39:08
You never get the bios screen?

clear your bios setting so they only load the factory defaults and try again.

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July 24, 2009 at 10:51:27
nope. my monitor displays nothing at all...and yes, i've cleared BIOS more than once so far to no avail.. Thanks, though.

I have also removed, cleaned and re-seated both sticks of ram and the GPU so far.

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July 24, 2009 at 11:18:15
sounds like the mainboard is shot. Bulging capacitors?

You get the same beeps with a video card in vs no video card in?

PCI or AGP video card? Could be your agv slot is toast. Can you try a pci card?

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Related Solutions

July 24, 2009 at 11:46:07
Sorry for not being as descriptive as possible. I'm kinda borderline noob when it comes to pcs.

PCIe x16 card.. yes, i get the 5 beep error code if no card is in and my mobo has no onboard video.

I cant use the second PCIe slot without a card in the first one, i think.. i get a green light on my board when a card is in the first slot and a red light if i switch it to the 2nd slot.

Assuming it is the mobo, i think it's pointless to try to dig up an old 939 mobo at this point.. I still saw my mobo for sale for 299 bucks, which is rediculously out of the question.

So, if i had to replace my mobo, and i had NO intention of using dual SLI cards, can anyone reccomend a cheap CPU mobo combo as an alternative to what i'm using now? I believe my CPU functioned as dual 2.8gig chips or thereabouts.. so something comparable to that would be nice.. and since only the cpu and mobo are affected by it being 939 i should be able to use my other parts in a new setup, right? oh, also its SATA...

thanks for any help

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July 24, 2009 at 14:30:40
Do you have the video card connected to the power supply? It most likely requires a 6-pin plug.

Did you try removing the PCI-e x16 card & using a standard PCI card?

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July 24, 2009 at 14:45:59
yes, the 7900 gs that i was running successfully for a year and a half had the six pin power cable attached.. the replacement card i bought doesn't require one..

both cards are PCIe x16 cards, though..

also, given how many people experience this problem, why is it that no one can step up and say here's what's wrong, here's how to fix it with any certainty? lol

i mean, somewhere on earth are people who design these components and know every single inch of any computer inside and out yet when this problem comes about, everyone says go fish :P

not that i'm not appreciative, mind you.. please, keep the suggestions coming!

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July 24, 2009 at 14:51:42
sorry.. something else that might be useful...

this problem didn't just happen overnight.. it actually took a few months.. sometimes it'd take days to get it running again by just rebooting til it worked.. sometimes longer..

anyway, during my pc's last week of life everything was very dim... i had to turn up the brightness in my windows settings and on my monitor as well as adjusting the gamma in any games i played just to get it close to 'normal'.. not sure if that's significant in any way

thanks again

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July 24, 2009 at 15:15:41
"anyway, during my pc's last week of life everything was very dim... i had to turn up the brightness in my windows settings and on my monitor as well as adjusting the gamma in any games i played just to get it close to 'normal'.. not sure if that's significant in any way"

It is significant. That sounds like a dying monitor. Have you tried it with another?

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July 24, 2009 at 15:35:15
yep.. at one point i actually had 3 monitors here and i got the 5 beeps with all of them... the monitor i'm using now i've tested on another rig and it works fine, it seems...

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July 24, 2009 at 16:34:18
You didn't answer my question...did you try a standard PCI video card? That will temporarily take the load off the power supply & *may* allow the system to boot with a display.

The one thing that you haven't provided any details about is the power supply, other than "i'm sure i'm not running anything less than a 400 watt PSU, but no more than 450w", which is totally useless. We need to know the make/model, the actual wattage rating (not a guess) & the amperage specs for the +3.3v, +5v & +12v rails. The info is on the PSU label.

Here's a look at the power consumption for the 7900GS...it could be that your PSU finally buckled under the strain:


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July 24, 2009 at 20:43:38
oh, sorry.. i mentioned that both cards i had were PCIe x16 but i should've added that i dont have any other cards to use..

also, i had no idea that the psu info was staring me in the face the whole time.. ><

be glad you aren't me lol

here's what was written:
model# IC-PSU-US-2545-DW Max Output 450W
Voltage Current Frequency
115/230V 10/5A 60/50HZ

+5V +3.5V +12V -5V -12V +5VSB
40A 28A 20A 0.5A 0.8A 2.0A

I actually have a friend giving me a 550W PSU tomorrow so I should know more in the coming hours.. thanks again

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July 26, 2009 at 12:29:05
so.. i guess it's fair to say that this problem is beyond diagnosis? everyone seems to have abandoned it in favor of problems that make sense.. lol

more's my woe

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