PC shutting down after succesful start-up

Oct 12, 2018
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Hi Guys, over the past few weeks I have been looking around these fora to find out what could be wrong with my PC. I bought my friend's old PC off him, as he has a shiny new OMEN BY HP going on. He said he had faulty RAM but the rest of the PC should work perfectly.. work perfectly is the last thing it has done sadly. I have since bought some new parts, but alas it is still not working properly.

The build now is:

MSI H170M-A Pro (flashed to newest BIOS)
Intel Core i5 7600K - 3.8 GHz - NEW
Corsair Vengeance LPX - DDR4 X2 - NEW
MSI GTX 960 GPU
Cooler master G550M power supply
Windows 10 x 64bit

At first the PC would randomly shut down when I would run games for multiple hours in a row; I thought it was probably due to overheating. MSI Afterburner and Coretemp show that neither my GPU or CPU go above 60-70 celcius. Sometimes when it would shutdown, then it wouldn't start up again and my EZ debug LED would show that there was something with the CPU. I feared that I had maybe blown it up at some point, so I thought let's buy a new one. However, even when installing the new one, getting new thermal paste and applying that to the CPU (and placing my Intel heatsink above it) it now starts up, but after it has booted and is not running anything it shuts down randomly.

I know nothing about PC's or building and I just can't fathom what the hell is wrong or how I fix this mess. It is honestly making me desperate atm. Anyone who has an idea what it could be? Do I need a new power supply with lots of extra power? Is it maybe that I have a lot of electrical appliances plugged into the same socket in the wall (I basically use two dividers - one that goes into 4 with external hardrive, nintendo Switch, but I put another divider in there to plug in my monitor, TV, phone charger, etc. Any help or solutions are greatly appreciated!
 
" Is it maybe that I have a lot of electrical appliances plugged into the same socket in the wall"

I strongly doubt this.

Although....I'm tending to think maybe there is an issue with the PSU.

Is it the original PSU?

Have you tried to measure/monitor the voltages?

If not.....you can use HWInfo or HWMonitor (both free) to monitor the voltages.

You want them to be within 5% of nominal. They should be +12, +5 and +3.3.

Now if while you are monitoring them they go outside the 5%, right away you know you need a new PSU.

If they don't go outside the 5%....but then it crashes....there is a logging function in both of those software packages that should log right up to the crash. However...this can get a bit tricky so I'm not going to go into that....but at least I would LOOK at the voltages. You may find that one is out of wack immediately.
 
Oct 12, 2018
2
0
10


Where do I check this? Sorry, I have no idea what I'm trying to look for :') I've downloaded HWInfo

https://imgur.com/a/1W8MoeI