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Intermittent VGA POST failure - likely cause?

post #1 of 12
Thread Starter 
I'm faced with a perplexing problem.

Lately my sig rig has been plagued by an intermittent issue with POST failures. The beep code (1 long, 2 short) indicates a VGA problem, so of course I try reseating the video card. I've used different PCI-E power connectors, I've tried different video cards. About the only thing I haven't done is switch PCI-E slots, although to be honest this same issue revealed itself a while ago when I had the 8800GTS in the second (lower) PCI-E slot.

The annoying thing is, it's an intermittent kind of problem. It's utterly unpredictable when the rig won't POST. Sometimes it does (it did tonight), but sometimes it doesn't.

I'm not sure what to make of this issue. I'm almost certain that it's not a graphics card problem; could it be that both of my PCI-E slots are dying?

Any ideas would help.

Thanks in advance.
    
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post #2 of 12
1. Make sure the pci-x slot is not overclocket (at 100mhz)
2. is the card getting enough juice (bios)
3. try testing it on a friends's computer or a backup computer with pci-x
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post #3 of 12
Here is one possibility...
A friend went through the same thing. It was a poor case to MB fit and the cards never seated properly because the MB sat a bit to high in the case and no shorter stand offs are available!
Make sure the card(s) are fully seated! If not or your not sure, you could remove the MB and do a bench setup on an insulated surface to test and view the vid card incertion for propper seating.
    
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post #4 of 12
that always pisses me off. my old gigabyte G965's "clip" to retain the gpu broke so the video card would "slide" up once in a while. I almost bought a new one just because of that!
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by Nevaziah View Post
1. Make sure the pci-x slot is not overclocket (at 100mhz)
2. is the card getting enough juice (bios)
3. try testing it on a friends's computer or a backup computer with pci-x
1. I could try to dial the PCI-E bus back down to default (100MHz); it's been sitting at 108MHz to get some stability back, per advice from The Duke and others.

2. I'm fairly sure the card is not under-powered, as I've played around with various PCI-E power connectors from my PSU. The auxiliary Asus "EZ Plug" (Molex power connector dedicated to the PCI-E graphics bus) has also been plugged in forever.

3. I've tested the cards on other rigs (I've got two available here - my office machine and my father's rig which I built for him last year), and I've consequently eliminated duff graphics cards as the cause.

Thanks so much for the suggestions, though! I appreciate it.
    
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post #6 of 12
Thread Starter 
Quote:
Originally Posted by The Duke View Post
Here is one possibility...
A friend went through the same thing. It was a poor case to MB fit and the cards never seated properly because the MB sat a bit to high in the case and no shorter stand offs are available!
Make sure the card(s) are fully seated! If not or your not sure, you could remove the MB and do a bench setup on an insulated surface to test and view the vid card incertion for propper seating.
Setting up a test setup outside the case is a good idea. I'll have to try that soon.

Just from eye-balling things, though, it sure looks like the fit of the card in the slot is fine. The problem has only really revealed itself lately, as well (although, a few months ago, it also revealed itself, only in the bottom slot), and it's intermittent.

Thanks for the input!

I wonder if vibration (caused by the fan on my HSF, perhaps..?) is making the card work loose? There's a thought...
    
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post #7 of 12
Fan vibration, if that is the case the thoughts of an RMA come to mind! It should not be vibrating!
    
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post #8 of 12
ita gotta be a seating issue like duke suggested, i had the same problem with my x1950pro on my old a8n-e. All i did was remove the bracket by unscrewing the little knobs for the video connectors then seating the videocard in. You can probably attach the bracket after seating the card and making sure it works but it may be kind of a force job so be careful
    
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by The Duke View Post
Fan vibration, if that is the case the thoughts of an RMA come to mind! It should not be vibrating!
Indeed!

It's the tiniest, high-frequency kind of vibration. I only cottoned on to it when the POST failure reared its ugly head, and I opened up the case to do some seating adjustments.

Come to think of it, that's probably the cause of the problems...

Must run tests...
    
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post #10 of 12
Thread Starter 
Quote:
Originally Posted by ||LAW||Doom View Post
ita gotta be a seating issue like duke suggested, i had the same problem with my x1950pro on my old a8n-e. All i did was remove the bracket by unscrewing the little knobs for the video connectors then seating the videocard in. You can probably attach the bracket after seating the card and making sure it works but it may be kind of a force job so be careful
Hmmm...

That sounds like too radical a solution to me. But, if i get really desperate, I suppose I can give that a try.

Thanks for the suggestion.
    
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