Been asking few people and its sounds more the the power supply but i dont know about the heat im using the LEET Monitor and it shows idle 80F gaming 110F(depends on what game). heres my PSU its off brand startech: http://www.startech.com/Computer-Parts/PSUs/ATX-Power-Supplies/Reliable-400-Watt-ATX12V-201-Power-Supply-with-20-and-24-pin-Connectors~ATX2POWER400 . happened on tuesday playing LoL just shutoff and restarted. its very random during games be any game really, if it is that PSU im thinking of the corsair 600w if its the heat need some tips.