Target Mode startup

I have a friends G4 iBook that has died and I get the grey screen of death soon aftyer startup. It will not start up on the system disks. I have an iMac and also a MacBook Pro. I was hoping someone could help me starting in Target disk mode from one of my other machines
Cheers
Graham

Yipeee
I have managed to startup the dead G4 with FW and Target mode.
Now all I need is some help doing a repair.
I used my Disk utility to do a repair and it said all was OK
I used Disk Warrior and it said all was Ok and no replacement needed but the G4 iBook still has the grey screen of death on startup
Any suggestions?

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