My 04 bmw ignition doest start

recheck the newly installed equipment new doesnt meant free from defects need to test and check ignition switch and wiring

Certainly sounds like a lack of power in the battery.
Do you have a genuine BMW battery or a cheapie replacement?
Have you tried to jump start the vehicle.
Batteries can seem ok, but when called upon, the power drawn out of them can be insufficient.
Try charging battery and starting on the charger- or just jump start to see what happens

Does the key have a alarm on it if it does youll need to replace the battery in the key.When the key is put in the transponder sends a signal to give spark and it does.then it starts. If you say the key doesnt have a alarm try this when the key is turn to the ACC position do you hear the pump. now if you crank it with the remote does the pump turn on? If yes you can do this go to the crank sensor pull on the harness(crank sensor has a tendency to get loose) does the crank move if it does youll need to tighten it up with the proper gap. if it doest solve it do this. close the door with the battery at a proper charge put the key in the door unlock it get in put the key in ignition now does it crank. If no you have a alarm problem.

there may be a damaged wire coming from the receiver ring which sits round your ignition lock, this "reads" your key and allows the starter to turn your engine over so if there is an intermittant fault here that could cause your non-starting.

could be a problem with the security chip in the key.

i have the same problem i was told to wack the starter with a hammer good luck

hi most likely the starter solenoid /unfortuntly it is integral with the starter so it's a replacement startermotor

Check the battery cables a loose connection can cause this. It they are tight check ignition switch.
With 2 key failures in such a short time it may be security ignition interrupt issue

HAVE YOU HAD THE BATTERY TESTED? ARE THE BATTERY TERMINALS/CABLES CLEAN AND FREE OF CORROSION? ARE THEY TIGHT?

Sounds like the battery is dead, you have just enough power to have the lights come on, but no cranking of the starter. Try putting the battery on a trickle charger, or hook up jumper cables to another car which is running. Let it run with the jumper cables connected for two mintues before you try and start your car.