Computer turned off by itself and wouldn't turn on...

Pulsedriver · 27 Dec 2007 at 20:24

Hey folks,

I was using my PC then I went downstairs for my dinner earlier, and when I came back up, my PC was off.

I pressed the power switch on the case, and it turned on, then turned off, then turned on, then turned off all by itself repeatedly. It kept doing this until I turned the power switch on the back of the PSU off, then back on, and now it loads up OK.

I've noticed when I start my PC anyway, it always turns on, for one second, then turns off, and then powers itself on and then works fine, I always thought it was to do with my motherboard...

What do you reckon? How can I check if its the PSU at fault? Is that what it looks like? (Spec in sig)
Temp seems ok as well...

Pulsedriver · 27 Dec 2007 at 20:35

Hi guys, I've just done installed speedfan, here is a screenshot;

Anything out of the ordinary?

Pulsedriver · 27 Dec 2007 at 21:40

My overclock returns to standard Q6600 speeds at random, I don't think im a fan of this Gigabyte motherboard.

At the moment its just running at stock speeds.

Pulsedriver · 27 Dec 2007 at 23:21

Hi mate,

Thing is, my board doesnt even remember it's overclock settings.

There was no minidump file from today

It was all working fine @ 3.2ghz, then maybe a week later it will boot up at stock settings. Then randomly decide to go to stock settings or 3.2ghz

I've googled the issue, and it seems to be a problem with the Gigabyte boards.

They also suffer a cold boot issue, which is similar to the whole on-off thing...

Pulsedriver · 30 Dec 2007 at 17:25

Sorry to bump this thread up,

But it's just happened again! I was downstairs, my comp was on in windows, not even doing anything! Not downloading etc just idle.

And it was off! Same thing happened!

I wonder has this something to do with my 8800GT crashing and freezing during 3dmark06?

PSU? 700W Surely is enough!?

Pulsedriver · 30 Dec 2007 at 18:33

I have a cheap one somewhere but it has no SATA power connectors, so that rules that out.

For the record, I posted that post above, then went downstairs, came back and comp was off again!
What I noticed was, to get the comp to start again, I had to actually disconnect the kettle plug at the back, and turn the psu rocker switch off then back on.

This is pointing at PSU, but surely at MOBO also?

I think it happens only when the PC is idling... It didn't happen at all when I was running memtest for 5 or 6 hours last night, but then that is a low power utility I guess...

Pulsedriver · 30 Dec 2007 at 19:14

Forget the tenner im just gonna get a new PSU, i'd rather spend the money and get a decent PSU, if it isnt that, i'll just make sure the PSU I get is better than the one I have lol.

However;

I got a BSOD a minute ago! With the error

avg7core.sys

at the bottom;

So I thought immediately, AVG.

Completely removed it from my system, tried a 3dmark06 and then got a BSOD after the CPU benchmark, and that BSOD says;

watchdog.sys

Bizarre!!!

Pulsedriver · 30 Dec 2007 at 19:20

Hi mate, im not sure I haven't changed the vcore settings as the system is now running as standard.

Pulsedriver · 30 Dec 2007 at 20:56