Unable to install Leopard on Mac Pro tower

Hi all,
I have a Mac Pro w/ 1gb RAM. It installs and runs Tiger just fine but is having problems getting up to Leopard.
When I try to boot to the DVD, it just sits at the grey Apple logo with the spinning icon (not beach ball). I've let it sit for hours and nothing comes up on the screen. No audible noise coming from media drive or the hard drive.
I've tried Target mode which yields the same results. There are no external devices or non standard PCI devices attached to the computer.
I am using a legit Leopard DVD installer and the Mac Pro has been wiped clean using disk utility. I've also reinstalled a clean version of Tiger and tried to upgrade (vs. clean install of Leopard), which also gives me the same results.
If I try to boot to the hard drive, I sometimes get the "purple space" Leopard screen, but all I do is watch the beach ball spin. Whats even more odd is that I never went through the Leopard install so I don't know where that's coming from.
Help!
Thanks in advance everyone

Thanks for the reply.
OK, I get none of those options as I never make it to the setup screens. I would like to do an erase and install, but again when the disk is blank or has a fresh Tiger install, I still don't make it past the Grey Apple icon screen.
I'd even take an Upgrade install at this point, but its not letting me do that either. After I did the erase/install Tiger install, I upgraded to 10.4.11 and popped the drive in. Clicked the installer icon which asks me to reboot, and I start all over with the above problems.

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