truck won't start
 

I have a 01 F350 7.3L power stroke. the truck won't turn over when i turn the key. I have tested the bats and starter all is good. I have power running from the bats to the starter soliniod relay to the starter. all fuses are good none burnt. replaced the cam sensior, still nothing. don't want to have to take to machnic for something I am over looking. Any help out there?