Computer won't recognise DVD as Startup Disc

What gives?
Startup with 'C' key doesn't work.
Even using Startup Disc in System Preferences doesn't show slot drive as an option.
I'm trying to do a disc repair because of hourly computer freezes with Mail, Safari and others that have not been resolved within the applications. Disk Utility fails when run using the MacHD as the Startup Disc shows:
Verifying volume “Macintosh HD”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Volume Bit Map needs minor repair
Checking volume information.
Invalid volume free block count
Invalid volume free block count
uld be %@ instead of %@)",2)
1990255
1990254
The volume Macintosh HD needs to be repaired.
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
Waiting for my new Diskwarrior but won't be able to rn it either if the computer won't start up from the slot drive.
Cheers

I am having the same problem.

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