Projector is not on
Make sure the projector is on. If you do not see a power LED (blue, green, or orange light) on the front of the projector, press the power button until it comes on. If no light comes on after several attempts, make sure the connections are properly connected.
Computer is asleep
If your computer projector was on and you stepped away from the computer, then upon returning, it was black, it is likely that the computer is asleep. Try moving your mouse, clicking the mouse buttons, or pressing any key (e.g. spacebar) on the keyboard to wake it up.
Check the data cable
Make sure the video cable you are using is firmly connected to the computer. It is recommended that the video cable is disconnected and reconnected to be sure there is positive contact on the connector.
Check the power cable
Make sure the projector is getting power by verifying there is a light on the front of the projector.
If you see no lights on the projector, make sure it is connected to a working wall outlet. If the power cord is removable from the back of the projector, try replacing it with another power cable. If you still cannot power on the projector after trying another wall outlet and cable, the projector may need to be replaced.
Check the LED status
If the projector has a light on the front, but that status light is orange, make sure the projector is not in a suspend mode by moving the mouse or pressing a key on the keyboard. It may be necessary to turn the computer and projector off and reconnect the data cable on the back of the computer and on the back of the projector. Turn the computer and projector back on.