PC Rebooting at desktop.

.:dhry:. Siro · 6 May 2008 at 21:43

Hi

I have been having a big problem with my PC. Specs: EVGA 680i, Enermax Galaxy 850w, C2D 6850, Corsair PC8500 (2gig), WD Raptor 150, 8800 GTX.

My PC has suddenly started rebooting itself when getting to the XP desktop. I get no bsod, it just reboots. Event viewer reports nothing. I have tried disabling "restart after system failiure" but it still reboots. This started to occur after I updated to the latest BIOS P32 via boot CD.

Heres what I have tried to fix the problem:

1. Cleared CMOS, no change.
2. Retried P32 update, no change.
3. Sent Motherboard off to OCUK for testing, they found no faults and it boots fine their end. They then sent it back to me.
4. Swapped PSU, no change.
5. Swapped GPU, no change.
6. Swapped memory, no change.
7. Tried new installation of XP - PC reboots halfway through installation.
8. Cannot get into safemode.
9. Changed Harddrives, no change.
10. Changed sata cables, no change.

I really am at a loss as to what to do, can anyone please offer some advice?

Thanks

Snakedoctor · 6 May 2008 at 21:46

Have you tried reverting back to the previous and working BIOS? If it isn't broke, dont fix it!

.:dhry:. Siro · 6 May 2008 at 21:52

Turophobic said:
Have you tried reverting back to the previous and working BIOS? If it isn't broke, dont fix it!

Yep.

Tell me about it.

Snakedoctor · 6 May 2008 at 22:09

Perhaps the BIOS update is a red herring, but it's odd that it should fail afterwards, yet reverting does not help. Perhaps you have a fault with the memory. Try one stick at a time or run Memtest on it.

.:dhry:. Siro · 10 May 2008 at 12:06

I took the PC to a local tech shop and they managed to get it booting up ok.

They discovered that if they put the memory to corsairs reccommended speeds the system was unstable. However, if they left it at motherboard stock speeds it was stable.

They got round this by overclocking the memory and fsb to just above the reccommended levels.

Memory: 1120mhz, 2.15V
FSB: 1400mhz, 1.4V
CPU: 3150mhz, 1.41V

This has now given me a stable system. What troubles me is that the system isnt stable at the reccommended settings and I have to overclock it to get stability. This leads me to believe there is still a fault with it but I am unsure where the fault is.

Any suggestions? So far I think its a bad BIOS file or poor memory?