LB1120 amber power led

My LB1120 let Modem worked for months on my RV and then after a few weeks in storage I can't get the LB1120 to work.

Using the factory power pack, plug it in, turn it on.  2 seconds later the Amber light turns on solid.  About 20 seconds pass and the amber power light goes out and stays out.  No other lights turn on at any point.

have tried:

power cycle

Reset to defaults per manual (doesn't seem to do anything, has no effect)

tried several power supplies (12v 1A+)

looking at it with a stern face

Any ideas appreciated, at this point it seems like it's not able to boot.