ComboDrive - CDs suddenly won't mount but DVDs will, after updates

I have a 15" 1.5Ghz Powerbook, have had it for a year and a half and still have Applecare on it. All was working fine and dandy until I made the big mistake of doing a small software update - which updated Safari to 1.3.2 i think, iTunes from 6.0.1 to 6.0.2, and another thing called "Powerbook Aluminium" which apparently had something to do with the battery life counter. Anyway, subsequently to that (today), every CD that I put in the drive either gets spat out again, fails to eject or just doesn't mount. Not music not data not nothing. DVDs still work fine however, i've watched a film and inserted the Apple DVDs.
So now I'm confused... if DVDs still work is the drive broken? Or do I need to put in new drivers or what. This is just frustrating as I listen to all of my CDs on my powerbook. I had an Audio CD in during the update which then could not be seen afterwards. Any clues?
Thanks

CDs and DVDs use 2 different optical subsystem: It may happen that the CD part dies while the DVD part keeps working fine.
If you dare to, you might try to clean the drive's lenses with compressed air - standard lens cleaner disks can't be used on slot in drives.

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