If the smartboard has a black screen and it won't display anything on the screen, here are the steps to try to get it back on.
The power button is on the left side of the TV but there is not enough clearance to put your finger to turn it on.
You can use a paper clip and press the power button.
When off, it's amber color, when on all buttons will be white.
If that doesn't resolve the issue then try resetting the TV by disconnecting the power source.
Directly under the TV there is a cabinet and the power cable is attached to the UPS. Disconnect, reconnect and then turn the TV back on.
When it starts to work you will see the bright colors for Smartboard.