Why does my cd player keep spitting out cds?

everytime i put a cd into my macbook pro it sounds like its reading it and then spits it out. ive tried restarting it and it is fully updated.

I had this problem today. Called Apple. They were extremely helpful. Sent me the following link--it fixed the problem immediately.
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM
Hope it helps you too.

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