IMac doesn't read DL CDs..!

When I insert a Dual Layer CD to my 27" iMac (late 2009), it doesnt read it and spits it out...
What might be the issue? and What could be it's solution?
Thanks for any help..

Tough to tell, are these blanks or recorded DVDs?
Is this in OSX or Windows???

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===============
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IMac doesn't read DL CDs..!

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