Sorry you are having trouble.

Obviously, it could be almost anything, but most likely is a power supply issue or a bad connection. Things to try:

1) Make sure you are using the Eventide power supply.

2) Swap the power supply connections between the two units.

3) Wiggle the power supply connection to the H9 when powered up to be sure it is not loose.

4) Tap the H9 when powered up to see if it has any internal bad connections.