Check for a blue light at the top of the screen. The light indicates that the screen is receiving power. If the light is off, make sure the power cords on the back of the subwoofer are connected securely.
Select the PROJ (Projector) option on the remote control, then select S-DWN to lower the screen.
The screen may be stuck in the closed position. Grasp the weighted bar that hangs from the bottom of the screen and pull it slightly to free it. Then try opening the screen again with the remote control.
The screen motor may have overheated if you repeatedly raised and lowered the screen. Let the motor cool for 5 to 10 minutes, then try operating the screen again.