Yellow, horizontal line fluctuations

I'm completely new to this forum but am hoping that someone will be able to help.
I've had my 12" PowerBook G4 for almost 4 years, and just today the screen started showing something really odd. There are a bunch of faint, yellow, horizontal lines spanning across the display, and they fluctuate whenever the computer is "thinking" or the display changes (e.g., cursor moves, web page loads, etc.) Also, the lines seem to be getting worse (more and more of them) over time.
I ran TechTool Delux from the AppleCare startup CD-ROM, but it didn't detect anything wrong with the video.
If this is stable, then it'll just be an annoyance and I'll live with it. But I'm worried about my screen suddenly dying. Any help/suggestions out there?

So, no solutions from anyone? Oh well...
At any rate, the problem doesn't seem to be getting worse. The overall quality of photos and figures now look "fuzzy", and colors are kind of dulled with a yellow-brown tinge. For now, I can live with this, especially since I can't afford a new computer right now!
Next week, I'm going to try a clean install of the OS. I doubt it will help my screen, but we'll see.

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