HT201250 my Imac doesn't read my cd's!!! "cd in blank" I can't solve it. any ideas?

my Imac doesn't read my cd's!!! "cd in blank" I can't solve it. any ideas?
When I insert it says Cd not readable " I bought a bunch of cd's and I need them a lot to study!! please any help will be thankful

1. Clean the CD.
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the appropriate method.
3. Try another brand  CD.
Best.

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