Any advice? My iMac keeps going to sleep right while I am using it. It is extremely annoying and hurting my productivity. It definitely happens more often when I am playing a game or have a lot of apps open. Also, when I am running Vista through bootcamp it will crash games to the desktop. I assume that this could be a problem with my graphics card or RAM? I am trying to get some advice here before going to Apple since I work at home and I really can't afford lost productivity while they hang on to the computer for two weeks. My iMac specs: 20" screen running 10.5.8 on the 2.4GHz intel core 2 duo. I have 2 GB 667 MHz DDR2 SDRAM (factory installed). The graphics card is an ATI Radeon HD2600 256MB Thanks in advance for your help.