First thing we always recommend is charge your batteries, sometimes when they start to get low things get finicky.
If that isn't the issue I would carefully inspect the Emerald board. Try to see if you can spot any damaged components on the PCB or broken wires. Do not remove the tape and try not to poke at the board too much, don't want to accidentally void the warranty. Posting some pics is always helpful too.
Figured the sound would be an issue before the led when it came to battery strength but i guess not? Board and wires look fine (and it recognizes the board when I plug it in and start the software.
So battery issue. I tried to use 2 chargers at home and just now tired a 3rd at work - none will charge the batteries. I used a different set of rechargeable batteries (Energizer 1500 mAh) and made sure they were fully charged and got sound and no led with them also.
Do i need the specific charger / batteries from US?