IMac crashed, has a weird screen when I try to boot (which it doesn't). What's wrong?

My iMac 24" (model late 2008, I think I ran Lion or Mountain Lion) froze when I was working in Adobe Photoshop, so I had to manually (using the power button) turn it off and on again. Then, 5 minutes later, working in Photoshop again, the computer froze again. But when I manually turned it off and then tried to turn it on again, it wouldn't boot. The bootup screen freezes when the Apple logo is on the screen and the loading icon appears underneath that. Also, the display acts all weird, which is kind of troubling:
Close up:
Then I tried different keyboard combinations for booting. When I tried cmd + shift ("Safe Mode" or "Safe Boot" I think it's called in English) a loading bar appeared and it loaded all the way until complete. Just when my hopes were up, the loading icon above appeared and it froze again, only then with a different loony pattern:
Does anyone here know what's wrong with my iMac? And what I can do to fix it? FYI: I don't have Apple Care.
Thanks!

The graphics processor or logic board is failing and would have to be replaced if you want to keep using the machine. Apple would probably decline to service it because of its age. An independent service provider might be willing, but the part may no longer be available.

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