I discovered via SeatGuru.com that DL's 737-800s have EmPower under the seats. On flight 747 yesterday CVG-SEA, which used a 737-800, there was indeed an EmPower port under my seat. I have a car charger for my computer which converts to an EmPower plug by unscrewing the top of the adapter, but when I plugged it in, it didn't work. I also tried the other EmPower port (I'm sure the gentleman in the other seat was wondering what the heck I was doing under his legs...), but it didn't work either.

Wondering what others' experiences with this are. I see three possibilities:

1. My adapter is broken or the prongs are set too far back (I've never had a chance to test it on any other EmPower-equipped planes to see if it works, though it works fine in the car)
2. EmPower was out to my row
3. EmPower was out to the whole plane

How often does EmPower work? Is there anything special the FA or captain needs to do to turn it on?