I have a 2006 BMW M6! this car will not start...changed starter, it started up! finished putting trim back together and NO START AGAIN! Help!

door change doesnt affect the immobilizer ---depending on how hard or the extent of damage sounds like theirs more damage else where to wiring -electronics -components

I got the same issue last month diagnostic proved it to be a crankshaft sensor.but do get the fuel pump chked 1st.

Check you battery 1st.. If it's good or not.. If it's good.. Change your starter motor

You should not have paid for the repair till you saw the car started ,the fault is entirely yours .Sorry i have no idea why this vehicle will not start without a play under the bonnet so get the so called electrician back and play dumb and dont pay one cent till he starts the car ,no start no pay its that simple

If you can catch it failing again, test for power on the small wire going to the starter solenoid while someone tries to crank it. If you have no power, check for power at starter relay and trace backwards. If you have power, you have a bad starter. They can have intermittent failures. Hopefully your starter is easy to access, some 3 series and 5 series have the starter mounted under the intake manifold and it is necessary to removed the maifold to replace or test the starter. Good luck, hope this helps.

Either the start relay is stuck, the ignition switch is defective or someone messed up the wiring. I'd start by checking out the relay then check the ignition by checking for battery voltage when the ignition is turned to start (at the relay)

The starter is tucked beneath the intake manifold back near the firewall. It is not easy to replace, but I would be shocked if you have a failed starter already on a 2006. Bosch starters usually last 12-15 years and a quarter-million miles.
Describe exactly what the car does and how it sounds when you attempt to start it. Just saying that the car will not start gives me nothing to go on.

it still sounds like you guys still have a starter problem are you sure you got everything put together right and if so maybe something is worn out inside and not making a good connection

You have a fault with the starter motor.That can drain the battery having a short in the motor.Changing the starter motor will solve your problem.

with the engine off put it in any gear and rock the car back and forward this should hopefully disengage the starter