Michele,
It seems that the amplifier is receiving power. The last thing you may want to try is swapping the power supply to the amplifier and plugging it to another outlet to ensure the issue is not power related. If the issue still occurs, then it seems that the amplifier may be defective. Please contact Technical Support via the web form on the knowledge base at www.prometheankb.com, select your region/language, Interactive Displays, Contact Us.
In the Existing case field input case number:287686 and include the serial number of the board along with shipping and contact information.
Thanks!