Tried to install OS X on my G4 and it is now stuck on Open Firmware screen

I have a powermac g4, with dual 450 processors. Bought in 2000 - After buying a brand new G5 last year I recently tried to install my OS X Tiger I got with the G5 onto the G4. Initially it all booted up fine. However when I turned it back on instead of booting up it made a long tone and then went to an Open Firmware screen with the prompts to type ‘shut-down’ or ‘reset-all’
Neither prompt works and this happens every time I turn it on. I have tried holding ‘c’ with original CD I got with the G4 to bring it back, I have tried holding ‘c’ with the OS X cd, I have tried to re-set Pram by holding down the appropriate keys but nothing works it just always makes the long tone noise and goes to the Open Firmware screen.
I have also been informed about updating the Frimware -i now have the software on a CD but cannot get the system back to be able to do this
Can anyone help me bring the G4 back to life?
G4 Powermac     Have a G5 too

Hi
You could order the Full Retail Version of OS X (Black DVD with a silver X on it). Regarding always starting up in Open Firmware, in this thread a bloke had the same problem until he disconnected his peripherals before restarting. See if the entire thread helps:
http://www.macworld.com/forums/ubbthreads/showflat.php?Cat=&Board=UBB13&Number=2 43591&Main=243591
Steve

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