Please check the following:
Check the remote's LED indicator. If it doesn't lit when you press a key please insert new batteries.
Make sure that the IR sensor on the screen is not obstructed.
Make sure you are using the remote within 3 meters of the screen.
If you are using a previous model of our waterproof remote, press the DFU button on the remote and try the remote again.
Reset your remote's IR address code to master code (factory default). Please refer to your remote's Programming Guide.
Check for screen's power. It's status LED should lit as long as there is power. Red - Standby, Green -On.
Check the power adaptor - it should have it's own status LED (Green)
Check your electrical power socket (using another electrical device...)