So I Really Need Some Help

A couple days ago my computer randomely crashed in the middle of a game of dota 2, i failed to boot until i hit the clear cmos button on my mobo. After trying a bunch of things it still randomely crashes, mostly in games but also when i was trying to make this post. Everytime i can only boot if i use the clear cmos button. I have tried basic things like running prime95 and checking the temps. right now my supsicion is that its either the Psu or mobo, or maybe a problem in the bios. Any help?

Tried updating the BIOS?