Symptom:
The Credit Card Terminal is completely black and appeared to be powered off.
Cause:
The unit is probably unplugged, the terminal plugs into a power outlet, and then again near to where it connects to the back of the computer.
How to Fix:
Check all connections to see if the power supply is plugged in at both the power source (wall or power strip) and at the connecting point near to the USB. If both of these are connected, check to see if anything else is without power. It is possible the power strip is unplugged, otherwise, contact the Help Desk for further assistance.