IMac won't boot from install disc

My iMac has been running a little slow the past two days and so I ran Disk Utility. DU reported that I had the incorrect number of thread records and an invalid volume count. It instructed me to repair the disk by booting from the install disc. The problem is that when I try to boot from the install disc (after I choose the disc from the options), I just get a gray screen with the apple logo on it. Nothing else happens, no disc activity, nothing.
Anyone have any ideas as to how to get my iMac to boot from the disc and, ultimately, to get Repair Disc running from DU?
Thanks,
Rich

It should only take a minute or so at most to boot from the DVD.
If your sure you have the correct Install Disk for that iMac, I'd start over. Then if it still doesn't work then perhaps a trip to your Local Apple Service Provider with the Disk or Disk and iMac is in order.
http://www.apple.com/buy/locator/service/
Alternately using the correct Disk as per the following article, see if you can run the Apple Hardware Test? > http://support.apple.com/kb/HT1509

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    of doing the job, you really should get the correct disc. In a few instances,
    another path may work, but is not recommended. And you could lose the
    content of the hard drive in the computer you are hoping to save.
    However, you may be able to use Pacifist to get Disk Utility from the PB G4
    installer disc to be made available on the desktop of the iBook, and use
    Pacifist to install that extracted package item from the other PPC install disc.
    This does not use the installers on the disc media, so Pacifist is used to do
    the process. The iBook ideally needs a replacement disc set, and that may
    be available from Apple online store's sales support (see online phone#)
    and the product would be matched by serial number. A fee is involved.
    The original software disc set would have the correct Apple Hardware Test
    and the software kit as included when the computer was new.
    If Tiger did not ship with the computer in question, then a full retail disc 10.4
    installer could probably be used; since it would be newer than, say 10.3.9.
    In natural progression, the newer disc of correct kind & type supported by
    the computer is a possible path; however a Leopard disc won't help fix Tiger.
    You could also use Disk Utility in one PPC Mac, via FireWire Target Disk
    mode, to repair the drive of the iBook. It would only appear as a hard drive.
    So, repairing disk permissions would not be possible, on a non-boot volume.
    This, only within limits; differences in build versions of OS and custom installs
    done to a computer configuration may make doing so very limited. I would
    not expect an Intel-Mac's version of the same OS to help a PPC in any way.
    Good luck & happy computing!
    { edited 2x }

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