IBook not waking up and screen changing colors

Hi everyone,
I've perused the previous posts and am having difficulty locating a post specific to my problem. My iBook is about 8 months old and has been working PERFECTLY up until a few days ago. The problem started when it wouldn't wake up after going to sleep. I'd close the screen as I've always done before, but when I opened it back up, it didn't seem to wake up. I subsequently had to do a hard reset. This continued throughout the day while I was testing it to see what the problem might be, then yesterday the screen started going crazy on me. It went black, then started randomly changing colors (green, red, blue, etc.). Clicking the mouse or hitting keys would do nothing. After a hard reset it would boot up and work fine for about 5 minutes or so, then the color changing would happen again. I haven't hooked it up to an external monitor yet...that's my next step. Any other ideas from anyone? Thanks!
iBook G4 Mac OS X (10.4.5)

So, I called Apple Support, and they instructed me to reset the PMU. I did so and the computer worked for about 20 minutes and now it's back to its old tricks. First the screen blacks out and then it either remains blacked out or goes crazy with randomnly changing colors. I can reset the PMU, but each time I do, it works for a few minutes, then blacks out again. I have Apple Care, so I'm not worried about the cost of any necessary repairs, but I am worried about the prospect of loosing my files. I don't have them backed up...I know, I know, I should have a file backup system. It's on the list of priorities. Any ideas/thoughts??

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