IMac won't boot up...wavy yellow/green/pink pixels on screen

Hey there,
I have a 24" 3.06 GHz Early 2008 model iMac. I installed Lion on it and it worked great for a couple weeks. One afternoon I was working on it and everything seemed to be fine, but when I left it for a couple hours while I was away, I came back and it would respond to anything. So I shut it down by holding the power button and tried to reboot it. It booted up to where the apple logo shows with the spinning loading gear wheel underneath, then after about 40 seconds it freezes. Also, there are a bunch of wavy yellow, pink, or green pixels that run horizontally across my screen. I've tried booting to the DVD and doing the hardware test with no luck. Does anyone have any idea what this would be?
Thank you so much for your time.

All I can suggest is a trip to an Apple repair station.
27" i7 iMac 10.6 , Mac OS X (10.7), G4 450 MP 1.5 GB RAM w/(10.5.8/10.4.11/9.2.2)

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Hello again C,
I have seen, or heard the partition for these older CRT imacs can only have a certain size partition to be recognized, is that true?
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IMac won't boot up...wavy yellow/green/pink pixels on screen

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