Owner: I shouldn't even attempt to explain why this is happening if Apple wasn't even able to fix it. However, I can at least describe the situations when it goes out. Sometimes it will not come on upon startup, so I restart it lifting the right side of the laptop while holding the left side down - I am in effect twisting the case. This seems to make a connection at that critical moment at startup - this trick doesn't work when the computer is already operating. Also, if the lid is shut or it goes to sleep it won't wake up sometimes - also if the LCD is adjusted in a certain way. So as you can see this connection (wherever it may be) should be fixed if the laptop will be opened or closed (or even moved for that matter?). This is pure speculation, but assuming you can locate this connection that is faulty, it could work for you.
Someone else's Response: Judging from your description (and inspection of my own PowerBook, Apple's service manuals and the video chip's data sheets) this sounds like either a hairline fracture in the mainboard PCB or connector failure.
Any help is greatly appreciated.
--- Kevin
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