Can anyone tell me how the Media Direct button on my new E1505 supposed to work ?

With the computer off, I can push the button to start the MD program. But when I close the cover, the program will stop.  When I re-open the cover,  the screen has turned black and the computer turned off.  After a few times, the MD button no longer work.

Is MD supposed to work with the cover open only ?

I'd like to be able to play a music CD with the cover closed (by using the front buttons).  Is it possible ?