I have a 2007 GMC Acadia. I bought a new ECU and installed it. It has a brand new battery in it and it's been pre programmed to the vin number when I ordered it. When I went to do the key program procedure it was doing what it's supposed to do, but when I went to crank it all the power shut off and my key got locked into the ignition on the on position and would not go back to the off position. I manually released the key by holding the switch behind the steering wheel and when I go to try it again... no power and it gets stuck in the on position again. I've called locksmiths and they don't know what's going on please help.