Interesting Display Problem

Hey all -

I am having an interesting issue with my screen that started this morning. I was watching The Office on Hulu when all of a sudden my screen turned to shades of purple and began to flicker randomly for about 30 seconds.

After this short time it went back to normal, although it essentially was locked up. I could still move my mouse and hear the audio from the show, but I could not click on anything and get a response.

I restarted my computer, opened up pages to type some notes, and after 5 minutes did it again. I turned it off, tried to reset my PRAM, and again after 5 minutes it did it again.

I (of course) am hoping its not a hardware issue. I downloaded "DropBox" yesterday and tried to just quit the program to see if that was the issue, but it still was doing it. Would it be worth to uninstall it (along with growl)?

Its interesting to me because after 30 seconds everything looks ok, and my screen even dims itself when I haven't touched it, I just can't click anything.

FYI I have a 2.2ghz MBP running Snow Leopard that I bought 2 years ago. Thanks for your help.

[EDIT: Well now my computer doesn't even boot up, and i am getting the grey screen of death that won't go even if I restart.]