mac book pro can't see optical drive

I need to install a program, have therefore inserted the CD into the optical drive, to discover that the optical drive is nowhere to be seen....

Checking the preferences in Finder, I see that CDs, DVDs & iPods are checked, to be seen everywhere, but I can't find the drive...

What gives....?

Does anyone know how to find the drive..?

Yours in anticipation,

Stuart...