most of the time its the cpu that shuts the comp.try seing the temp on it while or 30 min after play.if you have a software on that board theres probably somewhere where you can adjust the turn off safty temp.and set it a bit higher.it happened to me once with an abit bd7II board.i configured winbond moniter in biose and never happened afterwards.so you never know.gad bare ikke skrive på dansk,my danish sucks