Why would a Lumia charge connected to PC - but not outlet?

[stocktiki]

Hoping a pro here can help me out. Run out of ideas....

Lumia 810: Developer's Preview WP 8.1

Phone charges to 100% when connected via USB to PC.

But battery % sinks when plugged into wall outlet. The charging indicator shows activity in upper right-hand corner of screen.

Tried new battery. New USB cable. Different outlet. New power brick. Same result.

Also soft reset and hard reset.

Anything I'm missing?

 

[RumoredNow]

Sounds like you tried everything to eliminate hardware and almost everything to eliminate software.

Revert to official...