How can I get it to boot??

My 12" PB has a probably about completely full HD. I need to start it up and clean it out, but it's not booting - it gets to the grey startup screen (with the apple on it) and the circle spins for half an hour and then it gives me the 'your computer must be restarted' screen with the message in several languages.
I'd use the disc utility, but I can't find my original disc!!!
Any suggestions? I've tried to start in single user mode to use the fsck tool, but it won't start that way.

Welcome To  Discussions Rebecca!
"My 12" PB has a probably about completely full HD."
This situation could indeed cause a Kernel Panic.
You need to make some additional space available.
Do you have a recent backup of the system?
If not, you should try to retrieve as much critical data as possible.
If you have access to another Firewire enabled Mac, you could use Firewire Target Disk Mode, to attempt a back up.
If you are not able to startup the Mac, it will be difficult to resolve the Kernel Panic.
You also need to find or replace the system install discs.
ali b

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