Sorry but we can not do any such thing. We have no input as to what you do with the PC, what hardware you have, what software you run, what games you play if any, what changes you made to the PC prior to this event.
There is SOOOOOOOOOO much that goes into a PC that asking what could cause it without giving ANY information is like asking a blind man to describe a sunset. Please try to give SOME information so we can try to assist you.