3900 no power despite being plugged in. It quit suddenly. Any suggestions? Help.

The adapter itself seems to be ok.

Hi Chris,

Sorry to hear that your UD-3900 stopped working.

Could you directly contact us at support@plugable.com with the Amazon Order ID so that we could help you to narrow down the issue? Plugable offers 1-year product warranty - if it turned out that the unit got broken, we’ll be happy to send you the replacement.

Plugable Support