Not reading disks

I have a iMac 21.5" 2009 3.06GHz Intel Core 2 Duo, version 10.6.8 and all of a sudden it stopped reading discs, I tried inserting a copy of Snow Leopard to mount the disc via firewire on my macbook. I got an error message when I restarted my computer and it said Disc Non Readable and that was the copy of Snow Leopard.  I tried inserting my original iMac Installation DVDs and it just ejected the discs same as Snow Leopard.  I inserted a burned DVD that had some files on it and it mounted.  Any ideas????

Having a similar issue with my MacBook Pro OS x 10.6.8.  I'm responding to keep this discussion alive and maybe someone can help us.  I read something about trying to clean the optical drive, so I'm looking for a slot drive disk cleaner to try this weekend.  After that, I guess it's to the apple store.

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    Toshiba Forum Readers,
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     [email protected]

    Hi Michael!
    Congratulations!
    Perhaps you would like to mark your question as answered, and the relative posts accordingly!?
    What are question answers?
    When a community member posts a question as a topic starter, other members can post an answer in reply. Please note that not all replies actually answer the question.
    In some cases, an answer can be just some hints or helpful information to help the poster solve an issue. The originator of the topic can mark such a reply as a Helpful post. In other cases, a community member may post a specific answer that provides a solution to the original poster's issue. The originator can then mark this reply as a Solved post.
    The original topic poster has the choice to mark replies as either Helpful or Solved, or not mark a reply at all. In addition, the originator can end the discussion by marking the topic as Answered, which provides a visual cue—a green star—to the community members. This lets everyone know that the topic contains valid helpful information.
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  • My Mac Mini will not read TDK disks from my iMac G3.

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    Safe Mode - About
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