My 2004 BMW 530i won't start everything works and battery is fully charged but it won't turn over. tried jumping it won't turn over.

Remove the starter and bench test it with your battery charger. Apply the red connector from the charger to the large battery lug on the starter solenoid. Attach the black connector from the charger to the vise. have a 6 inch wire to use now to do the test. The 6 inch wire you will apply it the red positive connector and the touch the other end of the 6 inch wire to the solenoids small threaded lug. It will click if the solenoid is good and the drive should protrude out as if it meshing with the flywheel. It should be running quite fast as well. If one or more of these explainations are now working, replace this starter. If working you have a shorted wire or a faulty electrical ignition switch