IMacG4: DVD shows on desktop, but installation stops after a minute

With my iMac G4 (1.2 ghz + 1 gig dram), the Leopard DVD shows on the desktop. Go thru the install process, selecting "Erase and Install" on an external drive ... stops after about a minute or two with "Cannot install on this disk .. cannot validate(???) some files".
I've poured over this Discussion Board and have seen several other identical instances. I also have a DVD with no mfg or date stamp on either its inner or outer rings; further, the Apple logo is completely transparent.
I called Apple Tech Support, got bumped up to Level 2 Tech Support where I was told that I have not scientifically demonstrated that it is not my third-party (LaCie) firewire drive. That is mathematically true; however, with the volume of similar issues reported on this Forum, I reject this hypothesis as reasonable.
To continue, I called Sales and found a very nice gentleman with whom I shared every detail of my history, including the comments by Level 2 Tech Support. The sales person agreed to send me a replacement Leopard disk which I am expecting later today. Further, I intend to return my existing Leopard disk via snail mail.

To continue ...
I have also scoured macfixit.com and noted their detailed procedures to first clone the Leopard disk to one partition of an external drive, select this partition as the start-up drive, anf finally reboot the Mac and follow the instructions on "Erase and Install" on another partition or another external drive.
If the second Leopard disk fails, then I intend to meticulously follow the above cloning procedure.
Just one more thing, and this goes back to my frustrating experience in installing the then-brand new iWork 08. I proved beyond any scientific doubt that this installer demanded that there be no remnants of previous versions of iPages or Keynote anywhere. So I trashed these remnants and the subsequent installation was successful.
I am curious if this unreasonable requirement pertains to any of the individual installs that are part of the overall Leopard installation procedure??

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