i have the alu iMac 2.0 c2d with 2gb ram. i know that apple computers aren't really strong in the gaming department so i chose to only install low requirement games. i only have warcraft 3 frozen thrones for DotA and sims 2. when dota first froze my imac, i noticed the problem lies with overheating so i installed smcfancontrol, problem solved. few month later, i installed sims 2 which doesn't nearly work my graphic card as hard as dota. just after few minutes of playing, my i mac froze. i had to reset by pressing the power button. this problem persists even after re installation. i decided to uninstall sims 2 and just play dota instead. unfortunately, dota froze my computer for no reason as well. temperature was well below overheating this time. i know it could not possibly be my ram and processor as both of them are more than capable of playing both games. i'm using leopard and have every latest update. so what seems to be the problem?