PC randomly reboots after disabling automatic reboot

FenrirHS

Honorable
Feb 3, 2015
102
0
10,680
So, to begin, I've had a clutter of problems with my pc a year and a half after I bought it. It used to be a crash or two a month but it got more frequent to a point when every day I would experience frequent BSODs, auto reboots, and many other unpleasant things. So I sent it to the same shop they built my rig from, saying numerous times and leaving a note saying "please focus your attention on the PSU, it is the most likely cause." they didn't and just told me the HDD was more corrupted than a Bulgarian politician and replaced it.

After getting it back yesterday I did a clean windows 7 install (granted it is from a 3 year old disc but I've kept it in its case and away from dust). After installing all needed drivers, it perfectly ran for like 2 hours, then it rebooted on its own. Then the reboots happened after an hour, then 30 minutes, and so on until it became a case when windows boots, runs for like 30 seconds and crashes. can run it for like 30 minutes or so, then it auto reboots.

So today I ran memtest, it's all fine, used fur mark to stress test my gpu, it's all fine, ran cpuZ and it showed nothing wonky with my rig. So I have speed fan but when it comes to checking psu stability I'm clueless as to what to do. I then disabled auto restart and tried to see how long it could go if I put a little stress on it, so I played a video while playing Binding of Isaac and not 5 minutes after I did that it auto rebooted. I'm pretty sure it happens when my pc takes a slightly more than minimal workload. I really suspect the psu.

TL; DR: pc auto reboots after disabling auto reset. Restarts happen when it gets a slightly higher workload, can't be HDD, RAM, CPU, GPU, or a software issue. Reboots become more frequent after each one.

Specs:
Core i5 4690
R9 390 8gb
8gb ddr3 1600mhz corsair RAM
CM V750
Some random ASrock mobo I forgot the name of
WD blue 1tb HDD




 

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Question from FenrirHS : "PC randomly reboots after disabling automatic reboot"