Trevor,
If the power supply to the amplifier is plugged behind the board, you may want to check that it is plugged in or try another outlet to see if you are able to get power to the amp. If that doesn't help, try another power supply. If you are still unable to get the amp to power up, please contact us directly. If you are unsure about which number to call, there is a link below:
www.prometheanworld.com/.../technical-support-numbers
When calling us, please refer to case number 256341 and provide the serial number to the ActivBoard.
Thanks!