Computer boots to a black screen with prompts and code!?

hey
I have a Powerbook G4 15" 1.5GHz Aluminium.
I recently had big issues with the computer where it froze and kept crashing. The computer then completly died and i had to take it into an apple store for repair.
While it was in i had the ram slot failure repaired also (go apple!)
The technician repaired the directory structure on my hard drive but noted a program, which he thinks is XPostFacto has some how come to be installed on the system. I collected it and as soon as i got home backed up all the data i needed.
When booting the computer into OSX the startup would go to the grey screen with an Apple and the spinning gear. Then a black screen would come on and present me with a whole heap of code about the system etc the system would then proceed into OSX as normal. I managed to copy all the data i needed onto an external HDD however in the process the computer crashed multiple times.
I have now come to reformat the entire thing, i have zero'd the drives etc however even after that, when i boot from the install CD i still get this screen of code!!
I tried to install Panther and it won't work due to an error in installation..
What do i do?!?!?
I'm not too up for the idea of taking it back into the shop cause they will charge me mad prices ($120 an hour!) to fix it for me..
Any help would be awesome!
Powerbook 1.5 GHz G4 15" Aluminium   Mac OS X (10.3.8)  

Boot from the first of the system discs (by holding down the C key until the welcome screen goes away) and, in Disc Utility, repair privileges. Not just permissions, but privileges. Then reboot at normal. That will probably fix it.

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