Just tried to replace my nbsu switch. everything went fine, but now won't start. It acts liike it is not in Park. I was careful to keep the alignment clip on the new part, and keep truck in nuetral. My connections were really frozen, but everything else went fine. Any help? I need to go to work!

what does the display on the dash indicate? Also a little info about the truck would be a help, year and specs.

display on dash is all normal. the shift indicator box now works in all gears, just wont turn over. Truck is 2001 2500HD, 54,000 miles. Any suggestions?