Yesterday I go to wake my iMac from sleep and it just sits at a black screen, but the screen was on (you can see the screens backlighting is on). So it call applecare and they make me take the extra ram out of the computer and stuff and still no luck, so today I am going to take it to the applestore to see what they can do about it, because its still under warranty. Does anyone know what could cause this? and this is my 3rd apple computer and each one has had some sort of display problem, my performa died, was fixed and then the red color died, then the sound died. My iBook's keyboard died twice, the power adapter died, the display backlighting died, and the battery died, and now my iMac is having problems! This is really making Macs look unreliable in my family, since this compaq presario I am using right now is 5 years old but has never had a single problem.