Need Advice About Powerbook Start-up Issue

Hi all, I've been having issues with my Powerbook recently. First, was the narcoleptic thing that had been going on since November - that was fixed by Apple two weeks ago.
However, when I got it back, the PB would go to sleep early despite the SP settings, and/or shut down if I left my PB on battery power.
Today, the Powerbook will not startup. It will chime, but after that the display just stays black. The fans are running, but that's it.
I tried: the PMU reset, zapping PRAM (it won't do it), booting from the installer disk, booting from the hardware test, T-starting into my G5, etc. I also tried booting AC only and battery only. Still the display stays black, and I have to hold down the power button for it to turn off.
Any suggestions would be great...would like to avoid sending it into Apple again, but maybe that's unavoidable, short of purchasing another laptop?
Thanks!

Sometimes the easiest is the answer, try hitting the F2 key to bring up the brightness.
Hopefully your video is OK, maybe try hooking up an external monitor.
Target Disk Mode would also be in the mix of things to try.
Joe

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    Alan Myers
    San Jose, Calif., USA
    "Walk softly and carry a big lens."
    GEAR: 5DII, 7D(x2), 50D(x3), some other cameras, various lenses & accessories
    FLICKR & PRINTROOM 

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