Sittinguphigh,
The Magjack connector has two leds built into the outside rim of the RJ-45 connector (this Magjack is the silver connector on the left side of the ETD when looking at it). The one on the right is green and indicates power. The one on the left is yellow and flashes to indicate communication.
So, when looking at the ETD Magjack connector, if you have no lights at all, this means (probably) you are not getting any power to the unit and to the Magjack in particular. Troubleshooting : check solders for bridges, check solders for mis solder and solder problems, make sure unit is plugged in and the wall wart is plugged in.
If you have a green light, but no yellow flashing or yellow at all, this probably means you have a comm error between your computer and the ETD. Toubleshooting: Try replacing the cable, check PC/Laptop to see if the wired connection is showing something in the 169 range for the IP address, try connecting via a 'cross-connect' cable (as your PC may not auto negotiate straight connected network cables -- this is more prevalent in older computers), make sure your network adapter is working on your computer.
If you have a green light and the yellow flashes intermittently, then the Magjack is probably working correctly. Look elsewhere for your issue if you are having issues with the ETD still.
Kurt