A couple of days ago, my 17" iMac changed. I haven't changed any of the setting or preferences, but it has a green pixeled look to it. Anywhere there is a dark color (on pictures or words or anything) has turned bright green. It seems like it is moving as well. I've gone through the hardware troubleshooting from the installation disk and it doesn't indicate that it is a hardware issue. I don't know if I've explained this correctly, but don't know what's going on. If anyone has any suggestions, I would be very greatful.