I got the answer below on another site - it works - so posting it now in case it helps someone. :)
UNPLUG
just depending on when you tipped it over if there was water in there could be a problem with the level switch which controls water in and out.
Around the side of the machine at the top is a round device approx 3" dia usually front righ hand corner with a tube going to it and also wires.
Just release the tube from the spigot it is pushed on usually with a spring clip,the switch may be held in the "tub full"position hence no water coming in.
Releasing the tube will let any water residue that is stuck up there drain back down.
then try again.
Gerry
May 2009