I'm getting a Blue screen of death several time a day (on XP as well as Vista, so it's definitely a hardware problem), and I think the PSU might be the trouble. It's not even when it's doing anything particularly intensive, either.

I put the machine on sleep last night, and woke up this morning to find it had reset itself, as usual. At first I though the processor might be overheating, as it reset every few minutes whilst playing Bioshock, and running all the fans at 100% duty cycle (LOUD!) seemed to fix that, but now it's still BSODing, and it's very annoying!

Any thoughts? It does seem to be rather random, and I'm sure that a 620w PSU (and it wasn't a cheapo - it's a Corsair 620HW) is enough to comfortably power a Q6600, nForce 680 mobo, 3gb RAM, BD-RW, GeForce 8800 and a single hard drive and wireless card! My work machine is identical, only with no 8800 and an enermax libery PSU and that's fine!

Bah....

Sounds like a gunked up northbridge fan or processor fan. Are they spinning freely?

Sounds like a gunked up northbridge fan or processor fan. Are they spinning freely?

Processor fan is (Arctic cooling freezer 7 pro), but the North and southbridges are passively cooled by a fancy heatpipe arrangement. I'm half tempted to go down the water cooling route anyway...

have you tested the memory and hard drives for errors?

I'm getting a Blue screen of death several time a day (on XP as well as Vista, so it's definitely a hardware problem), and I think the PSU might be the trouble. It's not even when it's doing anything particularly intensive, either.

I put the machine on sleep last night, and woke up this morning to find it had reset itself, as usual. At first I though the processor might be overheating, as it reset every few minutes whilst playing Bioshock, and running all the fans at 100% duty cycle (LOUD!) seemed to fix that, but now it's still BSODing, and it's very annoying!

Any thoughts? It does seem to be rather random, and I'm sure that a 620w PSU (and it wasn't a cheapo - it's a Corsair 620HW) is enough to comfortably power a Q6600, nForce 680 mobo, 3gb RAM, BD-RW, GeForce 8800 and a single hard drive and wireless card! My work machine is identical, only with no 8800 and an enermax libery PSU and that's fine!

Bah....

My PC did same kind of thing when running Quad graphics on a 550w PSU, It did it every other day either BSOD or just rebooted without warning . After 2 weeks of this it did same with reboot but never came back on, the PSU smelt of electrical burning.

The 550w was about 2 months old and was a mid range £50 one ( forget name) Now i have a 650w SWEEX and it's never happened since.

is your cpu heastsink/fan full of dust? what are your cpu & case temperatures?

as the previous poster suggested, you should also check the memory (memtest86) and hard drive(s).

the psu wouldn't be the first thing i'd suspect.

Not under heavy load, CPU and mobo are both mid 30s celsius. The voltages all seem pretty stable, too.

I'll double check the memory later on, just to see what happens...

It's weird because it was perfectly stable for several months, and suddenly starts behaving erratically. Actually, it's not weird it's annoying!

Quick update.

I formatted the Vista partition (has V and XP), reinstalled, and that seems to have cured the BSODs, but now it just restarts! Only when watching movies, though...

To be honest I think it's a chipset issue with the motherboard. I have some tests planned with my work machine (Intel G33 chipset, as opposed to nforce 680i), just to be sure.

Had the same problems - take the RAM out and re-install - I had a loose connector which had looked fine!