Dvds can no longer be read on MacPro

DVD drive used to play Movie DVDs fine  but recently stopped - on inserting a DVD now, machine clicks for a while then ejects the DVD.
Inserting a CD (music) or data is fine - disc is accepted and available for access.
Any ideas why just the DVD rejected?

Hey Grant,
thought you'd like to know my "cleaning the lens with a cloth" worked fine - uh... but for about three days only, then back to the same old, same old.
I'd originally slid a business card covered with a lens cleaning cloth (from my camera bag) to clean the lens, and although the cloth emerged mostly pristine, I figured it must've done the trick as the drive started working again.
So this time, I decided to go in deeper. I actually took the whole drive apart - case off, drive out, drive dismantled - and I had a long look around to see if any parts looked dirty or damaged...
I found just one thing - the small silver rod on which the read/write head travels (the servomechanism that moves up and down the disc radius as it reads/writes) had some 'oily gunk' at the point where the travelling-head's 'sleeve' met it -  when I tried to move the head manually up and down the rod, it sort of staggered along. So I cleaned off the gunk with a cotton bud and then slid the drive-head up and down a few times 'till it seemed to run freely.
Put everything back - and fired up my Mac Pro. And the drive has been 100% fine since then - two whole weeks!
Maybe this time I've cracked it? (for my drive at least)
Roger

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