I have a 24" imac. I bought it right after leopard came out. My wife called me at work to tell me that the computer was running really slow all day and that it finally froze. She held down the power button on the back and when she turned it back on it went to the white screen and nothing else happened, there isn't even the flashing folder with question mark. It stays on the white screen, doesn't recognize any keyboard entries. I've reset the pram, tried to start from OSX disk, but nothing happens when I hold down "C". Tried holding down shift. I've tried everything. I really don't want to pay someone to fix this, so I'm going to start taking this thing apart if I don't get any more ideas. Please help.........Thank you.