Freezes during boot from HDD and DVD

Hello,

my PowerBook G4 1.67 GHz with 2 GB RAM freezed during the boot process after I foreced shoted down by pressed the powerbotten. It always stops at the white screen with the Apple logo and the spinner. The same thing happened while I trying to boot from the Install Disc. The Hardware Test also can´t work.

When I connet it to a mac mini under firewire connection. HD can be detected but hard to read.

I need to replace HD first?? or some serius problem happen?

Does anyone have useful clues?

Best regards

jyer