PowerBook won't boot and has crazy pixel patterns

Hi. I have a PowerBook G4 12" OSX 10.4 that seems to have gone seriously wrong. I can't get it to boot past the initial white screen, it just thinks about it for a few seconds then freezes. Booting from the system disc doesn't help either. The screen is also displaying a crazy pixel pattern over the normal graphics which seems to randomise every time the screen is updated. The issue came about when the device had a serious crash while playing music located on an external hard drive.
Is there anything I can try to fix this or is it a hardware issue that is beyond repair?
Thanks
Ian

HI Ian,
When you boot from the install disc are you holding down the C key?
Also, try Apple Hardware Test
You may be able to boot in Safe Mode
What is Safe Mode
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
Make sure there's enough free space on your PBook.
Right or control click the MacintoshHD icon. Click Get Info. In the Get Info window you will see Capacity and Available. Make sure you always have a minimum of 10% to 15% free disk space at all times.
Carolyn

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MixtapeChick:
Welcome to Apple Discussions. Congratulations on your "new" PowerBook. I suggest that you begin with this combination procedure:
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