When I turn on my iMac I here the fan spin up and the OSX sound, however the screen is a purplish black and the fan seems really slow. I thought it might be my RAM so I removed it and put it back in, but the problem persisted. I decided to open it up to see whats wrong, but this version is very tough to open up, because the back panel doesn't come off. I found out to open it up I would have to go through the front. So I'm wondering what my problem is. I'm currently thinking that it's the video card, but I'm not sure. Any help is appreciated!