Leopard on Dual 2.5GHz PowerPC G5 Mac Pro

Hi,
Just tried to install Leopard on the office Dual 2.5GHz PowerPC G5 Mac Pro. When I insert the DVD, it does not read it, pauses it and then ejects the disc. There is no warning or error message?
It reads and accesses other DVDs but I'm wondering if its because the Leopard DVD is dual layer and the reader is not?
Any help would be appreciated,
Barry

Guys, I have just picked up this thread as the original symptoms are similar to mine. I have purchased the retail version of leopard to install on my two Power PC G5 Dual 2.5s. Both machines spit out the installer dvd without it spinning up. The installer DVD however works fine in my MacBook Pro. Tech support are telling me the PowerPC is faulty and not reading the Dual Layer DVD which the Leopard installer is, although i find it quite strange BOTH my PowerPC Dual 2.5s have the exact same issue. Originally I thought the problem was the partition scheme and that the Installer DVD would only install to a Guid formatted partition, but the tech support said the Leopard DVD I purchased should install directly on to the older PowerPCs which have the apple partition format... we know the DVD is not faulty with at least my Intel machine, and it just seems too much of a coincidence that both my PowerPC G5s have fault DVD drives... which both read other DVDs fine. Any help welcome...

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