MacBook Inexplicably Stops Recognizing CD/DVD Drive

For the past month, my MacBook has had a problem in which it suddenly stops detecting it's optical drive (the one that came with it, that is). System Profiler insists it doesn't exist and I can't eject the CD that's currently in it. This has been solved before by rebooting or resetting the PMU, but this morning I tried rebooting and resetting both the PMU and PRAM to no avail; my optical drive and the disc inside it don't exist as far as my computer is concerned.
What do I do?

Still no progress. Fiddling with the PMU and PRAM and resetting helps sometimes, but it dies a bit later. Now it's back to absolutely no response. This is a serious problem, and I'm an inch from going to AppleCare and seeing if it's a bad cable or something.
I could use my other computer's optical drive, but I didn't pay 1300 dollars for a shot Superdrive. I also kind of want to get the DVD currently trapped in my computer out of it. Is there any kind of manual emergency-eject like the ones on earlier Apple optical drives?

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MacBook Inexplicably Stops Recognizing CD/DVD Drive

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