Random power failures when turning on immediately powers off with button press but if button is held powers on for 5-10 mins then hard shuts down I have brought it back to the computer guy that helped me build it 3 times we have replaced the PSU and tested everything on prime 95 plus wiped an reinstalled everything still within a few days of returning from the shop it proceeds to have this problem it happened at 2 separate houses on many different outlets but has never happen at the shop for the technician any ideas