Blurry and shaking monitor on iBook G4.

I have an iBook G4 that is about 2.5 years old. Just today I started to have problems with my monitor. It's blurry in some spots, clear in others. (I can move a text file around on the screen and see the words go in and out of focus.) It also shakes, sometimes by as much as 10 or 15 pixels in any direction, about once every few seconds. I haven't dropped the laptop recently (or ever, to be honest) and I haven't done anything out of the ordinary that may have caused these problems. Does anyone have any clues or suggestions as to what might be going on?
If it helps to know: when the computer has just been turned on and is loading, everything is perfectly clear and normal. After the menu bar loads, the screen quickly becomes blurry and expands a bit (I know it "expands" because the dock is lower and closer to the periphery of the screen). The same thing happens when I shut down or restart my computer: it'll be blurry and shaking, but after all the applications close and it's ready to turn off I notice that my screen is clear and normally-sized again.
Thanks in advance for any help.
EDIT: Also, it might help to know that the shakiness doesn't seem to correspond to me moving my cursor or anything like that... and that the blurry spots are distributed throughout the screen and aren't just on the edges.
Message was edited by: Madama Butterfly

Hey Madam,
First try an external monitor and post back.
The first thing that comes to mind is the GPU and it's possible that a shim repair will fix it.
Richard

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