When I installed Snow Leopard, it did the installer for a bit, but then the screen went black and the CD drive stopped spinning. After 10 minutes or so, I held the power button and rebooted, only to see the flashing folder with a '?' in the middle. Now when I try to run the Snow Leopard DVD, it shows the normal boot procedure, but then when it should be going into the installer, the display goes blank instead, but I can still hear the CD drive spinning as if it's doing everything correctly except starting the display. Is anyone else having this issue?