Eric> There's evidence of multiple problems here, so you should
Eric> perform some fault isolation:
Eric> 2. The Bad self ID messages on Mac indicate a different problem: the
Eric> FireWire bus isn't working properly. You should try other
Eric> FireWire devices on this Mac (alone, not in combination with
Eric> the suspect DVD drive or anything else) and try to determine
Eric> if the Mac is broken, or if the problem is limited to the DVD
Eric> drive. If other devices seem to work, try to use the DVD with
Eric> a shorter FireWire cable, or place it behind a FireWire hub
Eric> that is connected to AC power. These steps may help isolate
Eric> the problem, and might meet your immediate need of running the
I flagged this message but then got busy with work and never responded.
I picked up a powered Firewire hub and connect the device through that.
In that configuration, everything works fine. I sucessfully upgraded
the iMac. I didn't go through any of the other steps as at the time, I
had no other firewire devices I could try.
Unfortunately, I paid insufficient attention to the "recommendation" to
upgrade the firmware and now have a dead video board :-(