So heres the skinny; iMac was working fine no problems what so ever, watch movies, play games do, do them at the same time too. On Wednesday night, i notice the screen go black and I figured it just went to sleep so I left it alone. The next day i found out it wasn't asleep, but off so I tried turning it on to no avail. Tried the SMC reset didn't work as it was supposed to. I had to wait at least 10-15 min for the SMC reset to work, I had left the plug out for that time and only then did it work. So it booted up and everything was running smoothly again, until it just shut off on me again. I re did the SMC process again and booted it up and shut it off and then tried powering it back on. Works. Then again it shuts off when im using it. Its not making any weird noises, and the fans seem to be running appropriately. Tested watching a movie for temperature rating and its at 42 C and I even turned the fans on highest via istatspro and it still zapped on me. So clearly it may not be due to overheating, but a power supply? Thats what I think but im not too positive and im wondering if anyone else has had this problem and can guide me in the right direction. I don't got apple care and I don't really wanna fork over an arm and a leg for the problem to come back. Help anyone I also think its utter bs that a company like apple charges you to friggin ask them whats wrong with your computer. Extremely frustrating EDIT: I loaded up the Windows partition as well, and it zapped there too. I can't run a hardware test because it doesn't stay on long enough for that to happen. Update: So It seems that my iMac turns off whenever im watching a movie or playing a game, the temp reaches about 42 C and then shuts off even with the fans at max.