A.V. Display Issues - Projector, Elmo, etc.
Projector
1) Verify the cables are securely connected between both, computer output and projector or wall panel.
2) Verify the wall panel is on the proper input.
3) Attempt to change the output type; The Windows key + P combination
Computer only is the default option–and the name says it all.
Duplicate clones your screen to a connected secondary display, monitor or projector.
Extend expands the desktop so you can make room for extra windows.
Projector only turns off your laptop's LCD and turns the projector into your monitor.

Elmo
1) Verify the cables are securely connected between both, computer output and projector or wall panel.
2) Attempt to change the output type; The Windows key + P combination
Computer only is the default option–and the name says it all.
Duplicate clones your screen to a connected secondary display, monitor or projector.
Extend expands the desktop so you can make room for extra windows.
Projector only turns off your laptop's LCD and turns the projector into your monitor.