Can't start up from optical drive

I can't get my MacBook to start up from the optical dis drive, It does not get recognised either when I start up and hold 'C' or when I select it under Start Up Disk in the System Preferences. Any suggestions? Thanx.

are u using the Efi password protection utility? youll have to bypass/disable/turn off that first. Its got a feature that will disable the startup keys

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