PC keeps turning off

GodAtum · 12 Apr 2013 at 14:00

Hi all,

My PC keeps turning off randomly. I checked the temps, they are around 40-50 on general usage so i dont think its that. I opened it up and checked all the connections which are fine. I tried to leave it on the BIOS and safe mode but it still turns off. Perhaps it's my PSU (a be quiet 1000W)? I dont have a spare to check though and I cant buy a new one as I will be buying a new PC later this year.

BuToNz · 12 Apr 2013 at 14:12

Anything in the event logs giving an indication of what happens? Does it just turn off suddenly or go through the shutdown procedure?

GodAtum · 12 Apr 2013 at 14:16

It turns off suddenly. there is still the correct lights on the mbb though. there is nothing in the event logs apart from a "The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly."

I have also tried different wall sockets and unplugged any external connections such as USB devices.

The Slayer_UK · 12 Apr 2013 at 14:53

Try reseating the Ram also take one out and try it with one in there (if you have more than 1) does it blue screen then turn off or just completely shuts off and does not turn back on?

GodAtum · 12 Apr 2013 at 15:01

It does not blue screen, just turns off. i have to pres the power button a few times before it turns on. I have run memtest which passed.

The Slayer_UK · 12 Apr 2013 at 15:09

Ok just done a quick search and someone else had a similar problem and they was told to download HWmonitor when they ran it they found the 12v rail was only running at 8.9 volts and apparently it should be within 10% of 12v (according to the other forum) and this is why it was failing randomly im not saying this is the same as yours but it might be something to check

Rooster212 · 12 Apr 2013 at 15:20

HWMonitor will never be 100% accurate. I'd check in the BIOS, you should have voltage in there somewhere. Obviously the issue comes if the voltages only drop off when you are under load.

If you want to use HWMonitor, check the BIOS, then check the voltage at idle in Windows using HWMonitor. If they match, then maybe you can trust it.

GodAtum · 12 Apr 2013 at 15:26

Thanks for the tip, heres my results:

hwmonitor by GodAtum, on Flickr

BuToNz · 12 Apr 2013 at 18:31

Run Prime95 or similar while checking those temps/voltages. Keep a close eye on the +12v and temps before it shuts down (If it does).

It looks fine at the moment, only stress testing will show a difference.

CaNsA · 12 Apr 2013 at 18:45

It may sound stupid but.....

Check the power cable is fully plugged at the wall and the PSU.

GodAtum · 12 Apr 2013 at 19:02

Yep checked that and also tried diff wall sockets.

Its been running for a few hours now, touch wood!

wazza300 · 12 Apr 2013 at 19:05

is it x58?

any bsod codes or is it just an instant off?

GodAtum · 12 Apr 2013 at 20:34

No it just turns straight off. Its a i7 920 processor and asus p6t mbb.

wazza300 · 12 Apr 2013 at 20:35

what amount of dram/vtt are you using?

GodAtum · 12 Apr 2013 at 22:00

wazza300 said:
what amount of dram/vtt are you using?

Its just the default values as i have not touched the BIOS or done any OCing.

wazza300 · 13 Apr 2013 at 00:23

could you try with dram/vtt set to 1.315v and see if it crashes then

I ran that amount on my x58 just fine,your well within intel safe limits

Raikiri · 13 Apr 2013 at 00:45

For idle those temps on the CPU look a little high, not excessively so but not great and the 12v is a little on the low side.

As said run prime95 and keep track of the temps/voltages.

troops · 13 Apr 2013 at 01:06

I agree the 12v seems low, it might drop more under load as well.
Had a similar problem a while back but that was due to a faulty power switch.