Try to boot from the CD the computer shipped with.
Insert CD and restart the computer holding the "c" key Your computer should boot.
If so run disk utility from the cd and repair the disk as well as permissions. If this is successful your computer "should" be repaired. If it still has problems booting, Use your CD to perform a Archive and install which should keep all your personal settings and installed software intact.
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The Powerbook G4 power button functions like a reset button if you hold the power button in for a few seconds until the computer powers down.
Hold the power button in for a few seconds (until you see the screen turn off/go black and hear the fans & hard drive stop spinning).
Press the power button again to turn your computer on.
If you have more trouble, you may need to boot in Safe Mode or "perform a Safe Boot": Press and hold down the "Shift" key immediately after you hear the start-up tone. Release the "Shift" key when the gray Apple icon appears on the screen.
Just remove ur CMOS battery and harddisk connection from motherboard. And then try to restart it will give u a msg no boot device or OS found.. Now reboot and add the CMOS battery and harddisk on motherboard...
If you can hear that it's trying, it might be getting pinched while trying to eject, especially if something pressed down on the case at that spot. Try gently widening the opening with a flat head screwdriver while you are ejecting the CD. just put the driver in and twist a bit to widen the slot. Also, check to make sure that the fuzzy stuff that brushes off the disk when you insert it - and keeps out dust - hasn't been damaged. If it is partially missing, the missing part may be inside, keeping the CD from ejecting.
your lcd probably just went out or the connecting cable just came loose(its in behind the lcd under the apple logo that lights up when you turn it on) if you open and close it frequently it will cause this