Computer shuts off from sleep now doesnt power up

Ok the computer was running like a dream, I had a 570 gtx that went down sent it in to get fixed, and MSI sent me a new one. I install it then the problems began. The computer would go into sleep mode, and upon waking up, would promply shut down. When I went to restart the computer it would flash on and off (all components) then would stay off. A few times only the fans would turn on, then it would start up, Bios would be reset, but it would work, then I decided hey maybe its something to do with sleep mode, so I came in pc powered up played a game or 2 then powered it down, now it is doing the same. I dont know, but i feel its my psu, I have a coolermaster 1000w silent pro, but i dont know how to tell if its bad or not. Anyone know anything that may get me rolling again?