Q: car sat few months battery died replaced battery. now will not crank on 2001 BMW 325i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
worked fine when put up for winter. the key still works lock system. someone told me it could be my alarm system
(1) Answer
having same problem with 92, immobilizer is an led flashing ? what sometimes works is remove neg battery terminal and wait 15 mins or so then re connect or under glove box behind the panel is a wire harness connector that can be unplugged again for 15 or so and light nay stop wont turn over till light stops. UPDATE # DAYS LATER ! I got my immobilizer to turn off finally. here's how - I turned the key to the on position witch activated the system 4-ways led flashing fast etc. then I disconnected neg. cable from battery waited 15 min then put cable back on with key still in and on .it worked the led went out and i can start the car again.