The external power input has stopped working. Two different power supplies (Sony factory unit and Anton Power Tap) do not work any more. Is there a resettable fuse or there something more sinister here. Battery power works just fine
I had the opposite problem with my EX1 - stopped working from the Sony batteries, but worked fine from anything plugged into the external power input. Sony replaced the power board (under warranty, took couple of weeks). HTH.