IMac screen blue flashing tint - please advise

Please view the video of what the screen is doing because , well, just view it please, you will see.
http://www.islandsmoothiebeachtro.com/iMacScreen.avi - 17 mg avi
no I am not playing with any wires. and yes it does look pretty cool with the lighting, but something is wrong
It just started this evening when 4 hours before operation was working normally.
do not movie it, drop it, or what not, so you don't ask, it is one my my FCP editing iMacs.
did a techtool run, found nothing, even while it was happening.
PLEASE ADVISE as if it is a loose wire, a bad video card, or what?
planning to make an appointment with the genius bar for friday.

HI,
Boot from your install disc and run the Apple Hardware Test, instructions here.
http://support.apple.com/kb/ht1509
And About the Apple Hardware Test
Make a Genius Bar reservation here.
Carolyn

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