My iMac does not recognize its own disc burner.  What should I do?

I've had trouble in the past with the disc not ejecting, so I am leery of giving the drive anything to swallow that it does not ask for.  I usually tell iTunes to burn a disc and the wait for it to tell me to insert a blank disc.  But now when I go to burn a disc in iTunes (get into the playlist I want, select the proper command from the File menu, and then make the settings in the window that comes up to be the way I want them, instead of prompting me to insert a blank disc, it tells me that no disc burner or software can be found.  And system profiler reports that "no disc burning device was found. If the device is external, make sure it’s connected and turned on."  I burned a disc without a problem earlier today.  Do you think that was my last one?

I will try that if it happens again.  What I did, after restarting a couple of times and finding that the problem persisted, was open terminal and type "drutil poll" (and a couple of other "drutil" commands--but "poll" seemed to be the one that was doing something--if you just type "drutil" you will find a list of possibilities and their descriptions).  Then I restarted, and it worked fine.

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