Why is my iMac always ejecting cd's with mountain lion os?

Since updating my OS to Mountain Lion almost every cd I insert into my iMac ejects. There's nothing wrong with the cd's & can be read on another iMac we have with an older OS. Not really happy about this aspect of the new OS & I hope someone will be able to assist me with my delima.
Thanks!

Sorry to hear, are you still having a problem?

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