My imac has died I don't know what to do

I'm, not the best of mac users, but all I can say is, I've had my mac for 14 months, and the waruntee has ended, apple where ment to send us a letter to remind us to reknew it.
My screen has gone crazy, I don't know if it is the screen or the video card or anything, but I wasn't even touching the keyboard, I had a game running and was afk in it when the whole thing crashed, all the colours went ****** and It had big black lines going down the screen and it was completely frozen.
I turned it off and turned it on again and there was still the black lines going down he screen and doesn't go past the loading screen with the apple, and then says "you need to restart you computer, press the power butotn and hold it down for several seconds" and nothing works, please help asap I have work that needs to be handed in tomorow

You have experienced a kernel panic.
About "You need to restart your computer" (kernel panic) messages
You will need to take a look at Isolating issues in Mac OS X.
FYI, this is the discussion area for the iMac G4. Not sure if that is what you have or not (sounds like you have an Intel-based iMac) but the suggestion would be the same.

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