Can't boot to external drive from g5

Hi, I have a new 1TB firewire 800 external drive. I have 1 G5 with leopard 10.5.8 on it, but it had tiger on it at one point.
I installed tiger onto this external drive (10.4.4) However, after installing, I can't boot to the external drive.
I have tried going to the startup disk- it shows up in the options, but then just reboots back to my internal HD. I have also tried holding the option key down on restart, but the external disk doesn't show up.
Please help- I have put a lot of time and effort into this.

[Western Digital My Book Studio Edition 500GB|http://discussions.apple.com/thread.jspa?threadID=1899888&tstart=0] - is recognized but won't boot.
[List of Western Digital bootable and non bootable models|http://discussions.apple.com/message.jspa?messageID=9022456#9022456]
"DO NOT USE a ** WESTERN DIGITAL ** drive..."
Could well be a problem model, according to the above. I'd see about returning it.

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