Odd iBook G4 Boot Issue

Hi all,
I'm having a problem with my iBook G4 (14-inch, late 2004, 1.33GHz, 512MB RAM). The first stage of the problem occurred when I was getting a black screen with white lines across; I turned it off and on again, and then the computer wouldn't boot.
So after carefully moving it and setting it down on another flat surface, it would come back on again, and boot without issue. The iBook will stay on for most of the day, too- until I do one of two things:
1. Plug in an external USB device- in this case, my external USB drive (notable: it uses the iBook as a power source, not its own).
2. Move the comptuer around.
Then, the screen usually just switches to black pixels.
Interestingly, sometimes the computer will turn on- eventually- and oftentimes, it will boot right into OS X without issue; but it's rare, and usually it requires some sort of gentle physical movement (i.e: lifting it up and setting it down again) to have a chance. I have a feeling it's a logic board issue- something might have come unsoldered- but does anyone have a better theory?

Hi and welcome to the discussion forum,
This sounds like the classic GPU BGA problem. Especially the part about the lines on the display.
Search this forum for the shim fix. Eventually you could have it reballed, read all the posts about that esp. about the probability of killing the chip.
Richard

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