Large yellow firewire icon prevents my computer from booting up

A big yellow firewire icon that moves around the screen like an old screen saver and the computer does not load after touching the power button.
What might be going on with my firewire drive/card?
Thank you.

Your machine is booting up in Target Disk mode.  You may be able to clear this with a PRAM reset, holding down the cmd-option-P-R key combination at power on until you hear the second boot tone.  If that doesn't work, you will have to reset the non-volatile RAM in the machine.
To reset NVRAM, you need to boot into open firmware by holding down the cmd-option-O-F key combination at power up until you get to the white OF terminal screen.  Then enter the following two commands:
reset-nvram  <enter>
reset-all   <enter>
The second command will cause the machine to restart and it should some up and boot to the first available hard drive partition.

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