Why does my macbook pro keep on ejecting cd's?

Whenever I put a CD in, it will stay in there for about 30 seconds and then ejects. The ejcet button is not sticky or stuck. It's not just that CD. I tried numberous CD's and it will not stay inside.

Try to reset the SMC > http://support.apple.com/kb/HT3964 If it doesn't work, take the Mac to an Apple Store because the SuperDrive may be damaged

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