Repair Disk not available

My Mac Mini began to struggle to start up. I tried Disk Utility.
Verify disk gave the message:"This disk needs to be repaired. Start up your computer with another disk (such as your Mac OS X installation disc), and then use Disk Utility to repair this disk."
I have restarted the MacMini, holding down C with the Snow Leopard disk in the machine, and then tried to use Disk Utility but the 'Repair Disk' option is greyed out.
I have been around this cycle several times. I recalled the the original MacMini had a copy of DIsk Utility on them but when I tried that route it told me that I could not use it on my current version of Mac OSX.
Where do I go from here? Thanks
Message was edited by: Ron Bailey

Are you sure you are booting your Mini from the Snow Leopard disc?
The fact that the Repair Disk option is grayed out suggests that you are still booting from the internal disk. (You can't repair the disk you booted from.)
If you have a pre-2009 Mini and an old Apple Aluminum wireless keyboard, you probably can't use the C-key trick to boot from the DVD drive. That is a well-documented bug in this forum.
But if you have an Apple Remote, holding down the Menu button during startup works the same as holding down the Option Key -- namely it lets you select your startup (boot) disc/disk.

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