My Mac Mini (2009 version) does not let me boot from another device

I can see the other devices fine, it is just when I select any one the system keeps trying to boot and I get nothing. I can stop the retry process and choose my Mac hard drive ok. Of special note is I have recently discovered that my DVD drive does not function (not sure if this is relevant).

As Squiggle wrote, the external drive was definitely bootable.  It was a clean installation of Leopard (retail package) on an empty drive.  I tested it on my own mini before going over.  It did not boot on his mini.  The drive was visible.  It mounted properly.  It was visible, and selectable, in the "Startup Disk" system preference.  The mini went into an endless reboot cycle.  The only way to interrupt the cycle was to hold down the option key and select the internal drive (yes, the external drive was listed at this point as well).
After giving up on that approach we tried TDM, using the retail Leopard DVD in the DVD drive in my PowerBook. Again, the drive was visible, and selectable.  The same reboot cycle occurred, and the same method had to be used to break the cycle.
Yes, I zapped PRAM (not that I expected it to do anything).
The DVD drive in the mini appears to have problems, but will that prevent booting from any device other than the internal drive?
I'm stumped.

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