Faulty disc - won't mount, won't eject

After my first (and failed) attempt to use the OS disc burning I find I have a faulty DVD in my drive. It won’t mount, it won’t eject. Toast “knows’ the drive is in use but nothing else seems to and I can’t get the b*** disc out. Short of taking it in to be fixed, what can I do?
3-week old MacBook Pro. OS 10.5.8.
Amongst the various things I have tried is booting the machine with ‘C’ held down. That didn’t work either.
Message was edited by: Nature1953

Panic over. Disc Utility - after some fiddling - finally solved it. Phew.

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