No OSX installer will boot on Mac Pro from any drive (grey screen), but Windows installer does...

Greetings,
Neither OSX 10.5 (shipped with my Mac) or 10.6 disks will start on either of my Mac Pro dvd drives.  They will not run from my Macbook (Mac Pro on firewire target mode) either, nor from a partition on the Mac Pro HDD.  They always go as far as the grey logo screen with the spinning wheel, where they get stuck. 
Verbose mode will display the following lines where it gets stuck:
DSMOS has arrived
Warning - com apple.driver.InternalModemSupport declares no kernel dependencies; using com.apple.kernel.6.0
Then it lists two ethernet addresses and nothing else.
I have reset the PRAM about a hundred times in the last days.  Same goes for the SMC, well, maybe only a dozen times this one...  I have run fsck, too.
I can no longer run the hardware test on the install disk 2, but when I still could a couple of days ago, all was reported fine.
BTW Windows installer will load though...  What is going on here?!?
Any suggestion (other than suicide, yet anyway!) would be greatly appreciated.

Windows won't give a kernal panic or BSOD because it is a Mac related hardware issue.
If you can't boot from CD/DVD:
http://www.macfixit.com/article.php?story=20050311073316780
What resetting NVRAM does:
http://devworld.apple.com/qa/qa2001/qa1103.html
Your asking about a Mac Pro, but those are not "G5" and the OS can't be transferred between PowerMacs and Mac Pro.... are you sure we are talking about only Mac Pros?
Putting XP and Mac OS on the same drive, that doesn't strike me as what one would do; keep them on different drives.
And, if they are on the same drive, then you really haven't reformatted the drive, which would involve wiping any and all partitions, and then creating your Mac Standard (HFS+ Journaling) and backup XP with WinClone or install it to another drive.
I don't have trouble with Windows, but I do with the Boot Camp Assistant and drivers.

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