Dell E-Port Plus Replicator PR02X is supposed to come with 130W PA-4e AC Adapter.  It cannot be run without an adaptor.Manufacturer Part# : YP126
Dell Part# : 430-3114

The E-Port Plus Port Replicator with USB 3.0 from Dell™ offers dual digital monitor capabilities along with legacy ports. This docking station includes a latest USB 3.0 technology enabled by Intel in Ivy Bridge.

The M2800 is not a LATITUDE E series laptop.

Manufacturer Part# : GNPHP
Dell Part# : 331-6304

Compatibility
This product is compatible with the following systems:
Latitude E5440
Latitude E5540
Latitude E6440
Latitude E6540
Latitude E7240
Latitude E7440

Dell sold me this Dockingstation...so it should work?

It is Model NO PR02X

Class: BICES-003

DPN JKJ9X A01

You have to plug it into the back of the EPORT and plug into wall. Do that AFTER you have attached the laptop.

Then see if it works. It should then.

yes i have this big adapter, which was in the box.