Very big problems with BMW 528i!!!!!Help please!!!!!!!!!

HELP!!! I have BMW 528i (e-39). A few days ago at the morning engine don't want to start, starter works about 10 sec.,after what engine starting and work's normally. At the same day I changed all spark plugs, and check ignition coils. Ignition coils be OK. :mad: But the problem stay :mad: In that part of engine can be problem???

I had that same problem and i took it to the dealer and they fixed it.

I had that same problem and i took it to the dealer and they fixed it.
Im not sure if youre saying the engine turns but will not start, check to see if its the key control. the car may intermittently not recognizing the key. all power will be good but nothing will crank when you turn the key.
also do you know where the secondary airpump would be, i cant find it