Q: My G4 Apple PowerBook will not boot further than pale blue/grey screen displaying "flashing file symbol / flashing ?"

My G4 Apple PowerBook will not boot further than pale blue/grey screen displaying "flashing file symbol / flashing ?"

Last previous action:  Used Firewire cable and "Target Mode" to copy files from G4 eMac to the PowerBook.

I worked from the eMac to the PowerBook, making the PowerBook the "Target".      Files seemed to transfer OK.     Won't boot from InstallDisc.  Holding down T on startup results in Target mode screen.   I have a G4 iMac and a G4 eMac.    Can I use either of these with Firewire cable to boot-up my PowerBook ?

I'm new to using this Communities & Forums Help.   Can someone please help me to get going again ! !     Thanks for your time.  Graflood