HELP! PC randomly reboots/ shuts off / won't power on!

doddsydodds

Honorable
Jan 17, 2014
1
0
10,510
This started happening a few months ago and I have no idea why! My PC randomly restarts. Sometimes it will just reboot, other times it will reboot, start to load windows and reboots again, then it will just shut off whilst loading windows and I cannot power back on unless unplugged. I have tried resetting Bios, updating bios, cleaning heatsink, replacing thermal paste, checking for viruses, scanning for malware but it has changed nothing! Please help!
 

spigias

Distinguished
Dec 18, 2009
326
0
18,810

replace power supply?