Computer randomly turns off and won't restart

[nikkdiehl]

Hey all, I need help.
My computer is occasionally randomly powering off. This has only started happening in the past 2 weeks and I don't know why.

My computer is 4 or 5 years old, specs are:
Cpu: I5 4460 3.2ghz
Gpu: R9 290 tri-x OC
Psu: Cooler Master V750
Cooler: Geminll M5 Led
MB: Fatality ASRock H97
Ram: 16gb (2500mzh I think)

What happens is that I will be playing a random game that my computer usually can run quite fine, and all of a sudden, my entire PC shuts down instantly without warning. Immediately after, the PC trys to auto start up again with a quick blink of all my internal LED's and fans but fails and then won't turn on. Attempting to turn it back on most of the time results in 0 response at all, whilst other times it boots for a split second with the LED's and fans all turning on, but then it fails again.

I have to wait anywhere from 1 to 3 hours before switching it on actually works.

One thing to note is that if I switch the PSU on with the back switch, the LED for my ethernet cable is orange and on, but no other LED's in the case are on. The GPU LED's aren't on, and neither are the boards. I also have a small fan that has LED's but they're not on, and the main cooler LED's are also not on.

What's going on. My computer is eventually able to turn on, so is this a PSU over heating problem, or a PSU problem in general, a GPU overheating/general problem, a CPU overheating/general problem or a MB overheating/general problem?

 

[haza12d]

Might be a PSU Problem. Try swapping it for a fresh one asap and see if the problem persists.

 

[nikkdiehl]

Might be a PSU Problem. Try swapping it for a fresh one asap and see if the problem persists.

I did some updating of drivers and a little digging to find some event logs. Firstly, I found out I was using a driver from 2006 for my PCI-to-PCI bridge device. Not sure if this might be causing the issue, but I updated it.
Secondly, I found some event logs which show the power off event as a: Kernal-Power event, under system:

I'm now going to leave HWMonitor on whilst playing around to make sure the sys temp never goes above 40-60. I've been informed that if it does, the problem might be my MB. If it doesn't, but the problem persists, then it's most likely my PCU in some way or another.

I will update with more information once I have some.

 

[nikkdiehl]

Looks like it's most probably my Psu. After doing some tests and watching some monitors for temperatures when it shutdown, they all seem normal temp and the games I play never have any sort of bugs or lag or glitches. Average sys temp is around 30-40 with 20-30 on idle. Average cpu temp is 40-55 with 20-30 on idle. And average gpu temp is 60-80 with 40 as ideal temp. Everything appears completely normal, so it's most likely the psu.

I'm buying a new computer anyways in a weeks time, but I had planned to give my old one to my younger brother. I'll have to buy a new Psu if I plan to keep using it.