Screen turns alot of colors and sound contiues

I will be watching a video or coming back on after sleep and the screen will turn a bunch of colors. Some times the sound continues as normal, but other times a loud screeching noise starts. It has been happening for a couple of months. Its not very often just here and there. In the past when I had a PC and something like this happens it was the graphics card. It happened when I was running snow leopard and now I did a clean install of Lion it has happened for the first time last night. I have only had the 27inch mac for 5 or so months. Any advice?

The Basic Troubleshooting Steps are:
Restart... Reset... Restore from Backup...  Restore as New...
However...
In your caes (having dropped the iDevice) it looks like a Visit to an Apple Store or AASP (Authorized Apple Service Provider) is required... Be sure to make an appointment first...

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