Please help me Nav gurus!

I have an 03 BMW M3 with Nav problems. Searches all over the boards have left a few suggestions, but most arrows point here for the most information regarding bmw DVD Nav problems.

Last week it was -10 degrees here. When I went out to my car, I started it up and after clicking "accept" to the warning, I got an error:
"No DVD found, Please reinsert maps DVD" or something to that effect. Occassionally now it will say, "please wait".

Just like that...no warning signs of impending doom. Since then, the error stays. I have full function of my OBC, audio controls, settings, etc, just no maps/Nav!

I am running V27 and the 2006.1 maps, which I updated in 2006, and has been running flawlessly ever since until now.

I tried to do a hard reset by waiting until the light on the nav turned off, then disconnecting the battery for 10 minutes, then reattaching. This did not work. I put in the original maps disc, yet this did not help either.

Am I out of luck here? Is there anything else I could try short of buying another DVD drive? I am still under CPO warranty, but apparently Nav is not covered for CPO.

Thanks in advance!!