Powerbook G4 wont boot

Hi all
I'm new to the group as I have had my Powerbook for 15 months with no problems. Have not installed any new software nor changed any setting in the last 2 months.
Today the computer froze so I did a restart as per manual.
Turned back on, after the chime the Apple logo and the spinning timer thingy appeared but the machine will not boot up. Have tried re-booting several times (battery out for a time etc).
Same every time.
Put in install disk but that is now stuck in the disk drive and I cant eject it, even after re-boot.
Lost for any other ideas.
Help please!!!!
Any advice greatfully received
Don

try holding down the mouse button as you boot up...this should eject the disk, if not try holding down the eject button while booting up that may eject the disk as well...
you should be able to boot from the cd by holding down the 'c' key at startup as well...
you may try resetting the pram by holding down cmdoption+pr at startup as well...if you successfully get the machine to boot up with the install disk, run disk utility and verify the hard disk...then repair permissions from the dvd as well if the disk verifies...try these and get back to us...

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    :bixs but it just sais open Atapi-diak cant read disk label cant open cd:,
    :bixs. i tried startup manager but the disk isnt there and my mac hd is in the startup manager but has a little x in the picture what does that mean.  So anyone there can some one help me
        Xhevat.G
      just an ordinary mac user

    Disconnect all peripherals from your computer.
    Press the Power Button and immediately press and hold down the Command  and the S keys as the machine starts up.  This boots you into Single-user mode and you should see white text appear on the screen.
    When you see the # Command prompt, type /sbin/fsck-fy and hit the Return.
    Now sit back & let your computer do its thing.  This should take approximately 15 minutes or so.  Depending on how messed up your computer is.  Just be patient.
    If and when you see the message File System was modified repeat the steps above again & again until you hopefully see the message "no problems were found." When that happens type reboot and hit Return again.
    If these steps do not work then boot from your install disc to repair disk.  To use the Install Mac OS X disc, insert the disc, and restart your computer while holding down the C key as it starts up.
    Select your language.
    Once on the desktop, select Utility in the menu bar.
    Select Disk Utility.
    Select the disk or volume in the list of disks and volumes, and then click First Aid.
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    May be a solution on one of these links.
    Troubleshooting
    The X Lab (Troubleshooting & Maintenance of OS X)
    OS X Routine Maintenance & Generic Troubleshooting
    Prevent Mac Disasters
    Kernel Panic
    Mac OS X Kernel Panic FAQ
    Mac OS X Kernel Panic FAQ
    Resolving Kernel Panics
    12-Step Program to Isolate Freezes and/or Kernel Panics
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