The only thing you can check is that you're plugging the power source into the correct port and that the power supply is working.
Other than that, there are no user serviceable parts inside.

Is it possible that you plugged the power supply, by accident, into one of the charge ports?
Have you taken the Alpha4 apart to see what's inside?

If either one of those, you screwed up (taking the Alpha apart will disable the unit).

If the power supply is good, just send it back.

Highflight