What does "2 param error" on DVD drive mean?

DVD driver  on MacBook Pro  will not play. Spits DVDS and Cds out. Does not show up anywhere in system preferences. When I ask for "cds &dvds preferences" in Finder I get this message:
"The item cannot be opened. It may be disabled or not installed. 2 param error"
Anyone know where I should look or what to do to fix up my goof?

Either the fan motor or hard drive isn't working properly (the fan may be running, but too slowly).
Let Apple have a look at it:  http://www.apple.com/retail/geniusbar/
or click Contact at the bottom of this page and find an Apple Authorized Service Provider in your area.

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