Jugulator,
Congrats on getting a cool and rare gun. As you saw in the review, it has some quirks and awesome features due to being essentially a custom gun.
I'll ask a couple of questions for some basic troubleshooting and we'll see where we're at. I don't know your level of experience or whether you even received instructions with this gun, so forgive me if some questions are extremely basic:
Did you install a household 9 volt battery in the back of the gun? This is what actually turns the gun on, runs the counter and fire selector systems. You don't even need the LiPo installed for basic testing of the gun. If you can't get the lights and ammo counter screen to light up, the problem is in this circuit.
I found that a 7.4 didn't work my gun well at all, but it it has a high MaH, this shouldn't be a problem. WARNING! My gun has a continuous power draw and will ruin a LiPo overnight if I leave it plugged in. I do not know if this is a problem for all of these, or just mine (perhaps I didn't reassemble it correctly). Either way, do NOT leave the LiPo in it. Again, the health or even the presence of the LiPo does not affect the gun turning on.
My copy had a wire come loose in the battery compartment almost immediately as well. It was one of the wires running to the motor itself. If your loose wire had a slide-on clip, then this was the same issue. Not hard to get back with tweezers or needle-nosed pliers. Still, this wire won't stop the gun from turning on.
Did you get instructions with the gun? If not, I can scan and send you mine.
Finally, Evike has a few spare magazines for sale on their site. Loading the magazine in the field is a PITA. If you intend to game with this gun, get a spare (or two) while you can.
Let me know how it came out and we'll go from there.
Redshirt