1998 BMW 528i won't start. not even cli...

I purchased this car from a auction.

I already knew that this car had a bad alternator. The car would still start with a hot battery or a jump. since before I got a chance to change to alternator the car will not even start anymore. when I turn the key their is no clicking from the starter. all the power and everything comes on but no start. I know the starter is good because I ran a lead from the battery to the starter and that the only way for me to get the car to crank over but it still will not start. Im thinking it has somthing to do with the factory alarm system. But I dont know whats going on with it. I know the battery is fully charged and I also had a jump box hook up in the front to make sure it was fully powered.