Old G5 won't start in target disk mode.

I'm trying to migrate from my old G5 (2003) to a 'new' (second-hand) G5. When I run Migration Assisstant on the new one and it asks me to start the old machine in target disk mode the old machine won't boot up. I have wireless keyboard and have tried pressing 't' on start up to no avail so I have also tried rebooting via the 'Start Up' pane of System Preferences. When I do this it boots up to the blue screen with yellow firewire logo then after less than a second it powers down.
There are no other firewire devices plugged in and as far as I can tell all the firmware etc is up to date (Software Update runs every week)
Grateful for anyone who has any ideas.
Matt.

Hi Matt-
No chime is significant.....
It would be best to reset the PRAM on the old G5. This is best done with a wired keyboard, though you can try it with the wireless (may not work). Hold the CommandOption+PR keys and startup. Hold the keys until you hear the second startup chime, then release. The machine should then continue on to boot normally.
After the PRAM reset, the Startup chime should be restored, and, hopefully, so will Firewire Target Disk mode.

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