Whirlpool dishwasher ADP905 stopped part way through a wash cycle ?

The dishwasher stopped part way througha wash cycle, not sure of it was draining or still washing. Water was still in the bottom. Lights up and all that but it will not start.
I've drained the water and checked for blockages, none could be found, only parts i havent pulled apart yet is the main pump and heating section as I don't have hose clamps to put it back together.
Possible fixes please, computer boards look good, no shorting out i can see and all wiring looks in good nick.