I have a G5 running Leopard. Trouble starting. Hardware good. Cannot reinstall OS X. Error message 'Disc is damaged'

I have an old G5 that has been struggling at start up. Needed to reboot several times. Ran hardware check all OK. Attempted to reinstall the OS X and get error message ' Cannot install. disc is damaged' Disc looks good, no scratches.

That message refers to your hard drive, not the DVD!
You cannot perform repairs from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair:
http://support.apple.com/kb/HT1782?viewlocale=en_US
Once that is complete reboot again from your usual start-up disk.
More useful reading here:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/TS1417?viewlocale=en_US
For a full description of how to resolve Disk, Permission and Cache Corruption, you should read this FAQ from the X Lab:
http://www.thexlab.com/faqs/repairprocess.html
Apple's advice on general maintenance:
http://support.apple.com/kb/HT1147?viewlocale=en_US

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