Why won't my dishwasher drain?
	
	
		I've tried pressing "wash" and "rinse," thinking that might reset the d/w.  It begins to refill, then shuts off, because there's already water in there and I assume there's a level shutoff.
I've also pressed "cancel/drain."  
And I've unplugged the d/w, also in hopes of resetting in. 
I opening the d/w, and unscrewed the cap of the interior that spins around distributing water, thinking maybe there was something clogging/obstructing it.  The ring (gasket) beneath the cap has a crack in it, but I wouldn't think that would prevent the d/w from draining. 
Any tips?