"C" Key startup Problem

I am needing to run Repair Disk in disk utility by starting up with the Mac OS X install disc.
I have read over forums etc. and the apparent way to do this is by inserting the install disc and holding c down when the computer boots up.
Whenever i do this the mac thinks about it for a bit before ejecting the install disc and starting up normally?
Any help appreciated
Sam

okay so i tried that and i get 2 options , the mac os x option or the cd option.
i select the cd option and it thinks about it before once again ejecting the cd and starting up normally?
is the system not recognizing the cd as a start up disc? is there anyway else to run repair disc without having to use the start up method?

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