Only Mute on off light works

Alexa is dead except for the mute light that comes on and off when pressed. No ring light. Tried another working power adapter also that is from a identical working alexa. Unable to reset pressing action button. Amazon repair center wanted to replace it with a refurb one at a price higher than a new one. Found one comment on Google that claims it was a firmware update that failed midway. Alexa has not been opened. Not sure if Amazon repair center opened it.