IMac won't recognize DVD/CD drive anymore

As the title suggests, my iMac won't recognize my dvd drive anymore.
I don't know what the reason is for it.
I've never had this problem before, it happened a couple weeks ago.
I first noticed this when I tried burning a CD in iTunes.
It said at the top of the screen "Disc burner or software not found..."
I then went to System Profiler and checked "Disc Burning" and it
read, "No burning device was found. If you are using an external device please make sure that it is connected and powered properly." I'm not using an external device. I'm using the DVD drive that originally came with my iMac.
If anyone could please help me out with this I'd be very grateful.

Lately, I left my iMac on while I was sleeping. Couple nights ago, the optical drive made a funny noise and woke me up. It sounds very similar to opening up Disk Utility on my MacBook Pro, it looked for the internal optical drive. First, I didn't do further investigation on my iMac.
Yesterday, I happened to do some 'housecleaning' and attempted to slide in a data CD. The drive didn't response, so the CD was stuck. In the past, I had opened up numerous iMacs and they were getting more complicated model by model. I am certified to perform the repair, but since this iMac is covered under AppleCare, I decided to make an appointment with the MacGenius.
I did perform a PRAM reset earlier.
Do you have 'put the hard disk(s) to sleep when possible' checked under Energy Saver?
Out of all the Macs with slot-load optical drives built-in I have owned, this is the first malfunctioning I have ever had.

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