Computer randomly and suddenly turning off

[JoelT]

Hi everyone,
I'm having a problem with my computer after giving it a light clean inside and having it powered off for a week, it powers off after a random amount of time, sometimes straight after booting up or after 4 hours of up time. I thought it was a problem with my motherboard battery and replaced it and when the problem persisted I changed my power supply but nothing has worked so far.
My CPU seems to be fluctuating from 50-70 degrees and straight after re-booting my PC when it turns off, the CPU temp is still around the same range. So I don't think it is overheating.
Any ideas as to what may be causing this would be greatly appreciated.

My specs are:
Processor: AMD FX(tm)-6350 Six-Core Processor, 3.90 GHz
CPU Cooler: H100 corsair liquid cooler
Motherboard: Gigabyte 970A-UD3P
GPU: AMD FirePro W7000
8gb RAM
Power supply: EVGA 600w
Samsung 870QVO SSD 1TB

 

[andy_mk3]

I would go back and check you haven't knocked any cables. Give them all a physical check to make sure they're fully pushed into place. Make sure all fans spin up when you turn the PC on.

 

[JoelT]

I would go back and check you haven't knocked any cables. Give them all a physical check to make sure they're fully pushed into place. Make sure all fans spin up when you turn the PC on.

Thanks for response I made sure they're all firmly pushed in before and after replacing the power supply and all the fans seem to be working okay.