Desktop PC shutting down without heat issues or errors

Nick1987

Honorable
Dec 10, 2013
2
0
10,510
Desktop computer is shutting down (going completely black) without any errors on shutdown or startup. New thermal paste on cpu and temps seem normal. Shutdowns happen randomly from 15min - 5hrs of use. Thinking it could be the ram/psu/mobo but would appreciate other thoughts/possible solutions.