Unable to read/write CDs/DVDs

I have a Sony DVD RW DW-U10A combo drive. I have been unable to write CDs for a few weeks now, but manage with my MacBook. Now however, the drive in the iMac doesn't see either blank or written CDs, or professionally produced CDs. This also applies to all DVDs.
The only, but major, change that I have made is to upgrade to Tiger. I cannot categorically link the problem with the upgrade.
Could this be the cause of the problem? What can I do to be able to read/write CDs while using Tiger?
How can I clean the CD lense if that is also contributing to the problem?
Thanks in advance
PG

Hello and Welcome to Apple Discussions. 
You really need to repost over in the MacBook forums. The hardware is very different.
http://discussions.apple.com/forum.jspa?forumID=1172
regards
mrtotes

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