2004 Ford Taurus won't start

I would look into the starter solenoid. it has 3 lines going into it. it's and older car, the sole does not last forever! you grab one in a junk yard for a couple of bucks ( I do this all of the time in the junk yard). you would be AMAZED at how many brand new parts there are on a vehicle!! Secondly, I would definitely do some research on recalls of the key spindle, or get it replaced. But that is much more difficult to deal with. I would put that as a last resort idea.