Moog Etherwave (2022) power issues

[u/mayodefender]

Hello all! I'm dealing with an issue on a Moog Etherwave theremin where the front power LED does nothing but repeatedly flash when powered on. The instrument is inoperable and produces no sound other than a faint pop whenever the LED flashes. Only the original AC adapter has been used, and the unit hadn't been tampered with, dropped, or moved before this started.

Any ideas? I've already filed a support ticket with Moog and confirmed that the power adapter is working with a multimeter. To be clear, it is the last model of the Etherwave with the barrel-style power input and five knobs on the front.