My G5 Suddenly No Longer Sees My 10.4 System Folder, Only My 10.5 One

I primarily use Leopard on my G5 Power Mac but I have 10.4 installed on an external firewire drive as there are several applications I use that don't work with Leopard or that I haven't upgraded yet (Photoshop Elements for one).
It's always worked perfect for me until today... I wanted to switch and went to "Start-up Disk" and it no longer found the folder for 10.4. I checked the drive and all seemed in order... ran disk utility and the disk verified but the "repair permissions" button was grayed out. The only weirdness I noticed was a couple icons in my 10.4 folder that were white and aliases with arrows. They both referenced something about OS9. Huh? They weren't there until today. Without thinking I threw them out so I can't provide more info on those. Oops...
Anyway, now I decide to just re-install 10.4 and it won't let me. I try to install and it comes up with "Cannot be installed on this machine". Unless I'm crazy, I swear they are the original install disks that came with the machine as well. Taking it a step further, I also tried to install 10.2 from a store bought Disk and no joy... When I try and install it just goes back to my 10.5 system, but changes my desktop picture back to the default one. Weird...
So any help appreciated! Trying to work on a project and need my photoshop back!

Hi,
I've had several problems with Tiger & Panther HDs after running Leopard's DU on them, either function, perhaps this is happening to you.
DiskWarrior 4.1 seems to fix it ifyou use both the Disk & Files functions, sometimes not the first time.
With the Tiger Install Disks booted, might...
"Try Disk Utility
1. Insert the Mac OS X Install disc that came with your computer, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214

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