PC turning off at random times.. but all parts work under stress tests?

[flashheart85]

(not sure if i can post this here so sorry if i cant and delete it)

I'm working on a computer for somebody and it turns it self off (No errors etc). The pc can be on for 5mins or 5 hours before it turns off. I can be playing games, working on a spreadsheet or it can be just sat there idle when it happens. I have run multiple stress tests on the CPU, RAM, GPU, PSU etc and nothing ever shows up as wrong. It's as if somebody has just pulled the plug on a perfectly good pc (There are no slow downs before the crash etc)
Its currently running windows 10 (2 week old fresh install), i5 6700k (No overclock), 16gb of ram (DD4), 2070 Super GPU. 850W PSU, 2 hard drives (one ssd for o/s and one HHD)

(Only problems i can find)
The CPU (i5 6700k) reaches 48c under load... Which seems very low?
However, after running a three hour stress test it didn't crash and showed 0 Errors.

When checking events logs after a crash it simply says that
The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.

any idea? I don't really have any hardware from that generation to swap in and out. I do have a PSU but it's currently being used in a different system and it would be a ******* to get out.

ANy ideas?!

 

[flashheart85]

Sorry for late reply. Im a carerer and its been a bit of a crap week

The standoffs is a good shout. Had that happen before. It means you'll have to dismantle the whole thing, but at least you can start from scratch,and hopefully isolate the issue along the way. Just a tip, don't install the motherboard back into the case whilst you are testing. Put it onto an anti static mat,then add things individually. Good luck.
Edit: I also agree the PSU is the likely culprit. What model is it?

Same here! Took me days to work out that the standoff was missing and was buggering up the Mobo lol Ive checked and all are there. Ty though.

Why do I have this awful feeling that the PSU is some no name Chinese unit from 1996?

Its XFX which wasn't a 'bad' brand i seem to remember but it wasn't top of the range. I had one for 8 years before it popped until my new one (Corsair)

I am leaning towards PSU as well. I'm going to buy one from a certain rain forest.. and see if it is. IF it stays on.. ill keep it. If not ill return it.

thanks for everybody who helped fingers crossed!!

 

[flashheart85]

I have a Corsair VX 550 that still works. Bought it eons ago. Corsair is a reliable brand. I've had XFX cards crap out on me a few times. I'll send you the Corsair PSU for free if you pay postage. (Not sure on the rules here)

Thank you so much thats a really lovely offer. However, my friend purchased a PSU and im currently trying running some tests (Tests as in just leaving it on for 48hours to see if it shuts down lol). Thank you though once again!!!

 

[flashheart85]

Is this a new system, or a system that was previously working, but now has issues?
The other possibility (but a rare one) could be faulty mains wiring or dodgy mains socket. If you still have issues with the new PSU, try plugging the system into a socket on a different ring main in the house.

That is actually a really good idea! The plug it's plugged into was replaced somewhat recently. The issue seems to have been cured by a new psu (Hopfully) BUT if it goes again i think i'll try it on a new socket/loop. Thanks for that!