DVD Drive not recognized after install

[John T. Dillon III]

I recently download the 12.04 version 64 bit and installed and it went smooth (nice job).  After the reboot and working with the system, I was going to work with getting some music and play a movie or two. While doing this the machine no longer sees the dvd drive.  The machine is an acer aspire timeline 5810.  It is the same drive I used to install ubuntu from.  I used to ubuntu 11.10 and the drive worked fine.
Thanks for any guidance in this matter as I have been searching on it and to this point no luck.John 		 	   		  
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