Oh, and yes, I think that the thing labelled 'heater' in your picture in fact isn't. At least on my slightly earlier electronics there isn't a connector there, just some solder pads labelled 'LEDs' (and that's where I have my LED light strip connected to).
I don't have this same version of the electronics, so I can't compare directly. I do know that the brown-orange-green connection that is hanging loose there is for a second temperature sensor if you add a second extruder - it should correspond to a brown-orange-green connector that is hanging loose on the head.
I think that's the only connector or wire that can be unconnected. The heater is indeed a two-wire connection... but it's the fabric covered one that is supposed to connect to one of the green terminal blocks on the board.
Do you have any other loose wires? It would be a good idea to make sure all the connections are seated tightly on the electronics board, and at the head.
Do you get any messages on the Ulticontroller when it fails to heat?
Also, I presume you do have the printer power supply plugged in, and aren't just trying to run it over USB power.
Another thing to try might be to connect the computer over USB, and connect with Cura or Pronterface/Printrun and see if you get any error messages displayed when you try to print?
Also, if you haven't already, go ahead and open a ticket with Ultimaker Support.
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