Can't boot G5 from HD or CD/DVD

I'm trying to troubleshoot a 2005 iMac G5 (17" ambient light sensor model) that will no longer boot from the HD. It freezes with a spinning beachball on top of a blank blue screen (after the gray Apple logo screen). This machine originally came with Tiger, but was upgraded to Leopard (the most recent OS X that's compatible with a G5).
So I'm trying to boot from a CD/DVD -- either the Leopard install disk or the orignal Tiger OS disk that came with the machine.
When I try holding the Command key while booting, the startup manager opens, displaying the HD as an option. But when I insert the disk, it spins around for a while (with the cursor a timer icon), and eventually just ejects the disk without ever showing it as a boot option.
When I try holding the C key while booting (with the disk already in the drive), it spins around while displaying the gray screen (without the Apple logo), and then ejects the disk. After ejecting, it attempts to boot from the HD (gray Apple logo screen, followed by freezing on the blue screen).
What does it mean when it just ejects the disks like this? Does that indicate a logic board problem?
I've also tried tried resetting the SMU (by removing all cables, then reconnecting the power while holding down the power button), and I've tried resetting the PRAM and NVRAM (using Command+Option+P+R).
I'm not trying to recover any data. I'm just hoping to clear the drive and reinstall the OS to make the machine nominally useful, if possible. Is there something else I can try? Or does this sound like a lost cause?

I've also tried switching the RAM.
Does anyone know what would cause the disks to eject like this?

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    end_request: I/O error, device sr0, sector ....
    kernel panic_not syncing: attempted to kill init !
    pid: 1 comm: init Not tainted 3.0 - ARCH #1
    call trace:
    [<fffffffffffffffff812ae6al] panic+0xa0/0x1ad
    [<fffffffffffffffff...............] do_exit ...
    [.....................................] do_group_exit ...
    [.....................................] get_signal_to_diver....
    and caps lock  & scroll lock blink.
    any ideas?
    thanks for reply !
    EDIT: i tested /dev/sr0 and the result:
    sudo mount /dev/sr0 /mnt
    mount: /dev/sr0 is write-protected, mounting read-only.
    Last edited by angelfalls (2012-07-13 17:09:56)

    Yeah that's what I meant. Try to burn a new cd at a slower speed. When the new one is done create a hashsum of the new burn and compare it to the iso you used to burn it with. I only say this because a few times in the past when I had sr0 errors while booting live cds it was because the disk was messed up and I had to burn it again.

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