Only fan comes on with power after a drop

My wife dropped her 12-inch G4 1.5GHz PB. Afterwards, it wouldn't boot. When I pushed the power button, the fans came on and kept running, but that was it. I tried to boot from my Tiger DVD, but there was no change (and now I can't eject the DVD!)
I thought it might have been the hard drive, so I bought a new one and installed it. No change.
What else might be wrong? I'm kind of thinking the shock of the drop broke something on the logic board, which would mean that this is not worth fixing. But if I am overlooking something simple ...
Any ideas why the fan would come on with power but no screen, no gray apple, no DVD eject, etc.?
Hate to see this one die - it was a really solid little computer!

Chris:
You are never below the radar here. Since responders are all volunteers, we come to the forums when we have the time. Besides, many of us respond in several forums, and we respond to questions about which we feel we have something to contribute. And, finally, some forums have a larger number of contributors than others, and that is especially true of the OS X forums. Harware forums tend to be less visited by most responders.
I agree with your thinking of either selling individual parts or keeping the parts and buying a 'Book with a good logic board and possibly needing parts you have. Take a look at PowerBookTech for an idea of prices for parts.
Please do not hesitate to post back should you have further questions.
Cheers
cornelius

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    You are never below the radar here. Since responders are all volunteers, we come to the forums when we have the time. Besides, many of us respond in several forums, and we respond to questions about which we feel we have something to contribute. And, finally, some forums have a larger number of contributors than others, and that is especially true of the OS X forums. Harware forums tend to be less visited by most responders.
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