Can't boot off System Install Disc

I'm trying to boot off what I think is my original system install disc to run disc utility. When I do the dvd spins up for a minute, stops and the computer only displays a blank grey screen.The System Install disc is version 10.5. The computer, an intel i7 iMac, is running system 10.6.6. I also tried booting off the Snow Leopard install disc but had the same problem.
I'm trying to run disc utility off the install disc because I've been having problems with the machine, ran disc utility of the HD, and got the "This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X Install disc0, and then use Disc Utility to repair this disc"

Check the disc to make sure they are not dirty. Either disc will do the job, but the 10.6 is better, of course.
Try this: Boot the iMac normally and insert the disc. When it mounts, open the disc image and start the installer. It will ask you to restart. When it restarts you will be prompted to select a language. In the next window you can cancel the installer and open the disc utility to do your repairs.

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    Message was edited by: rkrktm

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    Sorry, OE = Original Equipment - the grey discs that came with your Mac.
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    However, as Snow Leopard only came on two retail versions, 10.6.0 and 10.6.3, the choice is a bit limited.
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  • Can't boot up from install disc

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    Message was edited by: den.thed
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    Message was edited by: Barbara Daniels1

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