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My iMac (quad-core i7 2.93 GHz, 27") frequently refuses to accept blank DVDs when I insert them for burning. What could be the cause of this? The machine is just over two years old now; does dust build up in there?

OS is Mountain Lion (10.8.0).

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How do you mean "accept"? – iglvzx Aug 8 '12 at 1:28
    
Does it reject all discs, including standard (pre recorded, not recordable / rewritable) CDs and DVDs? Or is it specifically blank DVDs that it's refusing? – Spiff Aug 8 '12 at 9:55
    
@iglvzx - I mean it spins it up and down a few times and then spits it out, as if it's an invalid disc. – Mr. Jefferson Aug 8 '12 at 17:31
    
@Spiff - I haven't tried a regular DVD, I will do that when I have a chance in a few days. – Mr. Jefferson Aug 8 '12 at 17:32
    
Does this forum offer you any additional info that may be of help? discussions.apple.com/thread/3312837?start=0&tstart=0 – slm Dec 29 '12 at 13:32

I had a similar problem. It accepts DVDs and CDs but spat out some software disks.
A solution that worked for me was to tilt iMac backwards (at least 90°) and then insert the disk.
This loaded fine!

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Are there any forum discussions or forums you could cite confirming this is the solution others have used as well? – slm Dec 29 '12 at 13:30

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