My vote is for power supply. What size/type is yours now?
Swapped out a Corsair 750MX with a Corsair 750 RX......don't ask me, I don't have a clue. The old one was semi moduler and the replacement was fully, totally moduler man!!
I used up another whole can (no doubt contributing to the greenhouse gases already up there) of dust off blowing out any stubborn dust bunnies while I was in there. Cleaned the water cooler radiator and fans, the memory sticks and the dust filter on the bottom for the PSU cooling fan. I put it all back together, started her up and nothing blew up or caught fire so I might have done something right for a change. we'll see.