Hi there, The last 2 days my iMac has completely frozen on me at random times. Frozen meaning, no mouse movement, no keyboard activity (caps lock not responding) and no OSX activity whatsoever. Temp at the time 41C, CPU Usage at 21% or smth, Fan speed at around 1200rpm. However, I don't get the infamous kernel panic error. I haven't changed anything hardware wise. I did have a couple of months ago the graphics glitch problem. Last software update was the iWork one. iMac is aluminium 20' with C2D 2.4 and ATi 2600 Pro. Thanks for your feedback. Much appreciated.