Original 10.4 disks will no longer work on MacPro after a Leopard install

I have an Intel MacPro that shipped with 10.4. I installed 10.5 on the machine. I have a need for either a 10.4 partition or to revert back to 10.4 entirely. When I attempt to install 10.4 from the original grey disks that came with the machine I get an error that this version of Mac OS X can't be installed on this machine. Same problem with an older Intel iMac. Neither recognizes their original disks, the MacPro will boot from its original disk, but won't install, the iMac does not even recognize its original disks. Did 10.5 do something funny to the firmware? If so (or even if not) is there a way to get these machines to "accept" the software they were born with or am in in Leopard-land forever with these two machines?

Some of the ideas here appear to require a pre-made backup on an
external disk drive such as a clone; of the previous system. Good
advice going into an upgrade, even then, it may not work. But should.
Mac OS X 10.5 Help: Reverting to a previous OS X version
http://docs.info.apple.com/article.html?path=Mac/10.5/en/15216.html
Of course, this path is worthless; as I have read dozens of topics on
the subject and none of them appear valid in your instanc!!
Is there any chance your Mac OS X 10.5 install disc
is really only an upgrade? They aren't a full service.
{Can you Archive and Install using the 10.4 disc, but not have it booted
up in the suspect computer? - It may revert that way. Desperate maybe.}
Since their is a percentage chance of something wrong with the computer
(but maybe not) you could consider the fee to discuss the issue with an
AppleCare tech, since that is still available after it has expired. If an issue
is not resolved in a discussion and suggested cure from them, ask what
if any recourse you have; if a call-back and other followups are free, etc.
This is an odd issue. Since I've been accustomed to making backup clones
that can boot my computers from externally enclosed hard disk drive units,
that is a path I try to be ready for; manual clones and not a Time machine
or other semi-automatic device. (Though the free-running clone utilities can
backup to a schedule, too; & offer a good full drive backup to a lite-backup.)
Sorry that I do not have a workable answer to the issue of the retail disc
not being seen by the computer as a boot volume; so complicating the
idea and need for you to revert from OS X 10.5 to the original OS X 10.4.
If things get rough for me, I have backup computers; living in a small town, in
a low-population semi-remote location does that. And backup generator, too.
{Is there a way to be able to use Leopard for your purposes, in at least one
Mac? Did you upgrade over Tiger in both? Sometimes, a full new install is
a best way to upgrade, wipe everything - but have that clone.}
Best wishes & regards...
Good luck & happy computing!
{ edited }

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