I have a Powerbook who's hard drive died. I got a new hard drive and an install disc that said it is only for a G4 powerbook. i booted from disc 1of 2 and it let me selectEnglish as the lang. but then said "Alert this software cannot be installed on this computer" and gives me 2 options : restart or startup disc. It will let me run disc utility but it will not install. Any idea why? Do I have the wrong discs even tho they say g4 powerbook?