Computer not posting.

Dodgy flash maybe ? It happens.

I've got a barebones sitting on my shelf where 'I think' it's had a partial flash. System was working fine albeit the motherboard didn't specify the cpu name - YES the little things :rolleyes:

So I decided to flash it - Powers up, vga works, then it hangs, can't even get into the BIOS - now it sits on my shelf wanting attention. I'm sure a BIOS replacement from the bay will fix it but I can't be asked tbh
 
I flashed my system and also my rig in theory should not need as much as 800W but the OCZ ModXStream Pro 700w I had was always dodgy from the get go. By any chance is this the brand your using?

If anyone has a quality powerfull psu I would definatly give it a go before shelling out for a mobo or anything else.

I take it you have booted outside of the case to take that out of the equation?
 
I just looked back on your post and you also have a OCZ psu and Gigabyte mobo, possible coinsidence.

My build when it broke down was:

Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366)
Gigabyte GA-EX58-UD5 Intel X58 (Socket 1366) PCI-Express DDR3 Motherboard
Asus ATI Radeon HD 4890 1GB GDDR5
Patriot Viper 6GB (3x2GB) DDR3 PC3-12800 (1600MHz) Low Latency Tri-Channel (PVT36G1600LLK)
OCZ ModXStream Pro 700w Silent SLI Ready ATX2 Modular Power Supply
LG GGC-H20L Blu-Ray Reader & HD-DVD ROM Serial ATA Drive
Western Digital Caviar Black 500GB SATA-II 32MB Cache - OEM (WD5001AALS)
Titan TTC-NK85TZ Fenrir CPU Cooler (Socket 754/939/940/AM2/LGA775/LGA1366)
 
The computer has always powered up, but it now very infrequently posts (when it does, the system is TOTALLY stable until it next is turned off/suspended)

I have now tried using my cpu in this computer, and everthing was fine. To try and be 100% sure i've also tried my RAM in this computer and everything was fine, i already tried my GPU in this computer and everything was fine, i've also tried my PSU in this computer and everything was fine.

I havn't tried my system out the case yet; that was going to be my next step now that the computer is already pretty much completely dissasembled.

Summarise:

(faulty computer):
known working PSU, RAM, GPU make no difference.
No non-essential items connected makes no difference.
Having GPU/RAM/CPU not connected (seperately and together); no beeps are issued signalling hardware faults at all.

(known working computer):
My PSU, RAM, GPU, CPU swapped in, everything is still fine.

So my PSU, RAM, GPU, CPU are all fine; and the only thing left since nothing else is connected to the faulty computer; is the mobo.

So I guess one last step is to move the mobo out of the case and test one very last time >.>

-------------

L1ght, your build there does seem a lot more power hungry than mine though, and no; both psu's are StealthXStream (Non-modular)

Subliminal Aura; that could possibly be the case I guess; but the thing that makes me think it is not; is that this happened a few times, a month or two before i flashed the BIOS and it started happening again, then lowering RAM overclocks resolved it until now where it's practicaly impossible to get it to post.
 
This does still sound like a possible power issue so if you get the chance, try a quality powerfull psu if you can, I won't keep banging on about the same point so good luck with the problem, I'll keep an eye out to see what the problem was.
 
I don't have access to any other PSU. But you're suggesting that neither PSU are powerful enough (with degradation) to power a barebones system; but both powerful enough to power a full system with (barebones) virtually-identical spec? (at virtually zero-load?)
 
Okay, so outside of the case it is exactly the same. Most of the time it doesn't post. Very occasionaly it will.

Equally, most of the time it doesn't issue any hardware fault beeps when no ram is installed, and very occasionaly it does; i'm guessing these are the occasions in which it would have gone on to POST.

So i can't see it being anything but my mobo then with every other potential component working fine in 'this' computer :(
 
unfortunately no :P That's one of the first things i tried swapping any time this happened, along with clearing the CMOS values. (And did it again just now 'just' incase)
 
I thought outside of the case was a longshot, but nevertheless its something to tick off. I also tried the cmos battery with no avail.

With the PSU option it could well be that its a duff and you could try and rma it if your still under warrenty. This would be the cheapest route but may take a while for the whole process.

What you could also do is take it to a pc repair shop and they will usually do a diagnosis for around £30 (where I live anyway) and you will know atleast after this what to buy.

At this point I would say through my experience and what you've said that its your PSU or maybe your motherboard. The issue with the psu may not be the fact that its not powerfull enough, but probably that its faulty.
 
I understand the PSU might've been faulty; that doesn't explain why it works fine in my other computer, and why my other computer's PSU failed to solve the problem?

a £30 diagnosis or new PSU would actually be just as expensive as a new motherboard at this point; heck i've barely even found any suitable replacement boards that are AM3 with DDR2, i've found 4 altogther (2 i wouldn't consider buying) and both have been in the £30-£40 mark :P
 
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