MacBook Air connected to projector won't display dvd in superdrive, but plays on macBook Air screen.

MacBook Air connected to projector won't display the dvd in the superdrive, but it is playing on the MacBook Air screen.
When dvd is ejected, MB A screen appears on the big screen through the projector. What do I need to do to get the training dvd showing on the screen?
Thanks

Power off the router. Unplug it from the wall. Wait a while.
Plug it back to the wall. Power the router on. Wait until all the lights are lit properly. It will take a while.
Restart the computer.
Start up in Safe Mode.
http://support.apple.com/kb/PH11212?viewlocale=en_US
Deselect proxies if selected.
System Preference > Network > Advanced  > Proxies Tab
Uncheck “Auto Proxy Discovery”.
Click OK, Apply.

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