Installed X.5 on external HD FW - Will not boot - I'm confused

Hi
Bought an external HD FW (500Gb)
Formatted it as Mac OS Extended (journaled)
Installed Mac OS X.5 Leopard
Selected Start-up disk - New ext HD
Doesn't work.
This I've done sinc system 7 I guess. Can't figure out why it doesn't work now.
Yours most confused Bengt W

You can check the partition scheme in Disk Utility by clicking on the topmost (drive) icon and looking at the bottom right of the screen, but even if it is Apple Partition Map, correct for your PPC macs, they probably still won't boot.
From this Western Digital support web page http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/stdadp.php?pfaqid=1715
====
Power PC based Macintosh computers are unable to boot to a My Book external hard drive.
Question
Why am I unable to boot to a WD My Book external hard drive using a Power PC (PPC) Based Macintosh computer?
Answer
Problem:
Power PC based Macintosh computer systems are unable to boot to the following My Book external hard drive:
* My Book Pro II Edition
* My Book Premium II Edition
* My Book Home Edition
* My Book Studio Edition
Intel Macintosh computers are not affected by this issue and are able to be booted from My Book external hard drives if the partition on the drive has been setup as a GUID partition scheme.
Cause:
This issue is a Macintosh bug cause by the Mac ROM code of the computer and how it attempts to boot from the first SCSI LUN it detects (LUN 0). In the case of the aforementioned hard drives, the LUN 0 device is dedicated to the button board and safe removal tools of the hard drive case and not the internal hard drive, thus causing booting to be impossible.
Resolution:
There is currently no resolution to this issue. If a resolution is found by Apple, this answer will be updated with this information.
=====
Hopefully you can exchange your drive for a different brand.

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