G5 mac dual 2ghz ppc shuts down after target disc boot

Please help. I'm trying to startup my ppc in TD mode and it shuts off after a brief showing of the firewire logo on the monitor... has anyone else seen this problem?
thx
a
g5 dual 2ghz ppc Mac OS X (10.4.8)

It is connected to a new intel mac pro. I'm trying to use the migration manager to transfer data. I have disconnected all other devices, and running just 1 monitor. I have taken RAM out (in a pair) in an attempt to reset the PRAM (but my keyboard commands do not work either) The only keyboard command that does work is "c"... ay ideas?

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