BMW 325i won't turn over

[Dlcfordtaurus]

Hope someone can help. Have a 2002 BMW 325i that had a problem staying running so I blew the fuel filter out in reverse and it was almost plugged solid. The car is running beautiful then my brother went to move it to weed eat, and it won't turn over. All the lights come on and u hear one click but that's it. I have tested batter and it reads around 12.56 volts. I checked bst and it has the same voltage as battery. Its almost like an anti theft action. Can it be the key isn't communicating with the car?? Please help.