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This was probably routed before most of the CAD tools were in good shape. It looks like there is a lot of cleanup that could be done now. Even this little section is a mess: It's a relatively simple design and just moving a few traces around clears up space for further cleanup and refinement...

Schematics would help, but a problem that fixes itself as you described sounds like a bad cap. Is this the board in question: I think that board generates the different voltages used by the machine from the main battery and/or the power brick. If you carefully probe the caps on this board...

Do you have a power adapter for a PowerBook? forums.macrumors.com/threads/how-to-use-a-g3-g4-power-adapter-on-a-clamshell-ibook-pismo-wallstreet-lombard-pdq-powerbook-g3-1400-3400.2393395/