Gaming pc keeps shutting down

[kieran_wilson23]

Evening guys.
Recently my pc has started randomly shutting its self off. I thought it might have been the graphics card over heating as the fans would go crazy after a while. I replaced the thermal paste and the fans are at a reasonable speed now. But it keeps shutting off.
I don't even have to be doing anything strenuous - sometimes my kids watching a movie and the system will shut off.
When I say shut off, it's like I've turned the power off at the wall. It just dies.
I can turn it back on and it may run for another hour or another 5 minutes. Completely random.
Now I'm not an expert on computers or all the complicated words but any help will be greatly appreciated.
Thanks in advance
Also apologies if I'm posting in the wrong category.

 

[kieran_wilson23]

Also I've recently done a factory reset on the system to eliminate a virus.

 

[toshibitsu]

Did you replace the thermal paste on the CPU or on the GPU? Or Both? Could be an issue with the power supply starting to fail

 

[kieran_wilson23]

Erm. Not sure

 

[kieran_wilson23]

Just googled it. I replaced the paste on the gpu

 

[toshibitsu]

If the GPU is overheating, then replacing the thermal paste with something of higher quality helps. Something like Arctic Silver MX-4 / Arctic Silver 5... if you really want to go all out, the best is Thermal Grizzly's Kryonaut(which is also the most expensive).

If your CPU is overheating, the same can apply to that.

 

[kieran_wilson23]

If the GPU is overheating, then replacing the thermal paste with something of higher quality helps. Something like Arctic Silver MX-4 / Arctic Silver 5... if you really want to go all out, the best is Thermal Grizzly's Kryonaut(which is also the most expensive).

I've just taken the cpu cooler off now that I know what it is. The thermal paste there is all crappy and the cpu is quite hot to the touch. I'll try replacing that first and see how I get on.
Thanks for your help so far

If your CPU is overheating, the same can apply to that.