Trying to install 10.5 on G5 imac

Hello:
I just came into possession of a G5 imac that I'm trying to upgrade to 10.5 Leopard.
It's a:
1.8Ghz G5
1.5 GB ram
80Gig HD
Unfortunately, when I pop in the 10.5 install dvd & select install......reboot.....during the reboot process, the system spits the dvd back out. The dvd has been used before, so I don't think *it is the issue. I **thought the system requirements had been met for upgrade to 10.5, but maybe not.
Suggestions??
TM

Try it this way:
Booting From An OS X Installer Disc
1. Insert OS X Installer Disc into the optical drive.
2. Restart the computer.
3. Immediately after the chime press and hold down the "C" key.
4. Release the key when the spinning gear below the dark gray Apple logo appears.
5. Wait for installer to finish loading.
If there's still a problem then usually it means a problem with the DVD or your optical drive. For the former I suggest a lint-free cloth and plain rubbing alcohol. Moisten the cloth and clean the DVD starting from the spindle and working outward in concentric circles. Check for scratches, dirt, fingerprints, etc. as all of these could cause the problem. Look closely at the tracks closest to the spindle core which is the area where the disc's boot block is written.

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Is there any method that can solve this problem?

Trying to install 10.5 on G5 imac

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