Reading CD & DVD discs => "Error File not found."

[jimkvg at 3web.com]

The DVD/CD drive had been reading discs ok when the Maverick 10.10 was  
freshly installed.  As time went by after some updates, the disc in  
the CD/DVD drive could not be read.  A small box popped up, "Error:  
File not found."  I tried some DVD and Cd disks, but no success.  It  
looks like the drive is disconnected.  I looked in Launchpad, but it  
frustrated me with trying to find solution.  Any idea what caused the  
problem?  Tip from you readers will be greatly appreciated.  Thank  
you.  Jim