Maytag Dryer runs for 5 seconds then shuts off

When I start the dryer, it runs for 5 seconds and then shuts off. doesn’t matter if its air, high or low heat. The drum will turn for the 5 seconds. the drum itself is "difficult" but not impossible to turn by hand, but will only turn 1 way.

sounds similar to this - but that thread died off with no definitive answer:
http://forum.appliancepartspros.com/dryer-repair/132632-dryer-starts-then-stops.html

any thoughts… I am attempting to take it apart to see if something is gummed up