PC Build of six-months+ turns off suddenly and turns on sometimes. Thermal paste gone-wrong?

[S1867th]

Hello there. About a day or two ago, I was trying to open a game and play it. Computer shut down after a few seconds.

I've been visiting tech-forums and asking for help. At first, I thought it was the power supply but it seems like the power supply can actually power the computer on somewhat. I'm actually using the computer right now. Yesterday, after playing the game it would shut down on and off and it would restart itself so I stopped myself from turning it on until today. Today, it's working and I'm just using the browser and don't have a lot of programs or apps. open.


This is my parts list:

Source 210 NZXT Case

8GB 4DDR Ram (I used Wins. Diagnostics, said no problems on it)

Gigabyte H110M-A Motherboard

EVGA 500B PSU NON-modular

NVIDIA GeForce GTX 950

Intel(R) Core(TM) i3-6100 CPU @ 3.70GHz, Intel64 Family 6 Model 94 Stepping 3

Maxtor Drive (Hard Drive)


I believe it's also important to note that when I built this pc, I would take the heating sink on and off (does that affect the thermal paste? I took it on and off).

Here's my readings (from official Gigabyte software which is the company that made my motherboard?):

W/OUT Prime-95:

http://i.imgur.com/aH1qw8B.png

W/Prime-95 (on stress-test, bland test mode, RAN it for FIVE minutes ONLY and took a ss. with prime-95 running):

http://i.imgur.com/PoQohuM.png

What do you guys think? Temps. a bit too high for an i3 6100 on stress-tests? Help?

 

[hang-the-9]

Removing and replacing the heatsink once, without running the system in between should not cause issues, and the temps look fine for the CPU.

You may want to reseat your components, and try a different known good power supply.

 

[S1867th]

By looking at my screenshots are you telling me that my PSU is defective or you're just guessing that it's not defective?

Because I used it yesterday and it was powering my pc but I think if I use anything intensive or something it shuts down. Sooo??? What's wrong with the PSU? Do you know?

 

[hang-the-9]

No way to know what exactly may be wrong with the PSU, but random shutdowns can mean a power issue, power issue means check the PSU first. Once that is ruled out you can check other things.