Mac OS X Install Disk doesn't show up

I forgot my original administrative password on my old Power Mac G5. My family has many macs so we have many Mac OS X Install disks. The disks that i have found say "iMac (Mac OS X Install)" on them. I am wondering if, even though it says iMac, it will work to reset the password, or if that is the reason the disk doesn't show up. I have tried putting the disks in, holding "c" and that doesn't work, and when I hold "Option" the only thing that shows up is the Macintosh HD.

Hi there, Gray Discs are Machine & Architecture specific.
If you can't find the G5s Tiger Disc, then...
Reset OS X Password Without an OS X CD...
http://theappleblog.com/2008/06/22/reset-os-x-password-without-an-os-x-cd/
Admin Hack...
http://www.hackmac.org/?q=node/4
Starts up like the first time you buy a new Mac, but after filling in all that info again, you should have access to the computer and the other Users & files will still be there... though I was just thinking, this new User probably shouldn't be the same name as an existing one.
If that doesn't work for you (and some users have reported it has not worked for them), try Niel's procedure Making the Setup Assistant reappear.
http://discussions.apple.com/thread.jspa?messageID=607547
I lost my admin user (Mac OS X 10.4 and earlier) ...
http://discussions.apple.com/thread.jspa?threadID=121786&tstart=0

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