Help? Powerbook gets power but won't start

I have a 1.5 GHz. 12" Powerbook Al (with empty RAM slot) that (reportedly) had a hard drive failure (blinking folder icon at boot)and so the HD was removed and the PB left in storage for approx. 6 months. Now, I am trying to resuscitate this PB and when I plug in the AC adapter, the charge status ring glows green. When I open the lid, it momentarily turns to amber. Pressing the Power button doesn't start the Powerbook. No fan noise, LCD lighting, etc. Battery LED status shows 2 LEDs green when button is pressed. I have tried resetting the PMU repeatedly and tried starting without the battery to no avail. Any suggestions on what other troubleshooting steps I should try? If this is a hardware failure, any idea of what parts may be suspect?
Thanks in advance for any help/suggestions.
/Tim Allison

Was this problem solved elsewhere? I'm surprised there was no response at all here. I'm having something pretty similar with my Al-Powerbook G4 15" FW800 (1.25gHz). Every so often, and I think only when it is stone-cold, it will start, although generally not recognize my AirPort card. Otherwise, it gives the startup tone, I can hear a bit of a grunt from the hard drive, and then a tiny bit of motion of some sort, and then nothing. There's a bit of ambient noise from inside when this is going on which I believe to be the disk spinning, but the heads aren't doing anything.
I have tried all the usual recommended steps (resetting PRAM, resetting PMU), can't get it to start at all now. There's a CD in the tray which when I hit the power button will start to spin, but then doesn't do anything. Again, it doesn't really seem to be reading the disk, and I get nothing on the screen at all at any time. It's completely black. Eventually (a couple of minutes) the drive(s) stop spinning, but it continues to draw power and gets hot.
Any thoughts?

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Help? Powerbook gets power but won't start

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