Battery charges, startup chime... blank screen, no fan.

This iBook G4 has had three DC-in cards, so when my son said it wouldn't start I figured it was time for yet another one. But with a new charge cord, the battery charges fine; all four green lights.

However, when I start it up, I get nothing on the screen. I see a keyboard light come on and I hear the happy-Mac chime, but there is no whirring sound and the screen stays blank. No white screen of death or flashing disk with a question mark, which I would expect from a dead hard drive. I popped it open and checked connections, but I didn't find anything loose.

I'm stumped. What should I try?

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Is the screen black or white? Can you discern the desktop with a flashlight?

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Appears to be black. I see no signs that the screen is booting up at all, plus there is the lack of whirring from the hard drive.

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Hook it up to an external monitor and let us know your results. See if you can discern the desktop by shinning a flashlight on the screen. Move the screen back and forth and see if anything happens.

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