So, suddenly today, while I was working my screen froze and began just flickering. When it was clear this wasn't something that will just unfreeze or stop I shut off the machine (using the power button) and restarted. It made its usual dong but froze right after. I attached a picture of what the screen looks like. Any clue what's wrong with it? My machine is an early 2008 dual quad core with 8800gt. Thanks for any help.