How To Power Up Touchscreen (Wall Mount)
To power up the Touchscreen, please follow steps below.
1. Locate PC - The PC is located behind the screen, in between the wall brackets. You will probably only be able to see the tip of the PC and power button. 
2. Power up PC - Press the power button. If the input of the screen is still on 'HDMI' it will power up the screen automatically. If it has changed for some reason (usually power loss), please see next steps....
Lights on the PC:
Amber is "Standby" and 'Red' indicates it is powered up
3. Select HDMI Source/Input - To select the 'HDMI' input, please find the power button on the back of the frame of the screen itself. Once you have found and pressed the power button, you will have to press the 'source' button quite quickly (before screen turns off automatically) and cycle till you find the 'HDMI' input.
Screen Buttons:
Power button -
If the buttons are on the left side of the screen (towards bottom of screen), the bottom button is the power button, and the 2nd from the bottom is the source/input button.
If the buttons are on the right side (towards top of screen), the top button is the power button, and the 2nd from the top is the source/input button
