The dispenser switch only transfers the incoming water from the soap compartment to either the bleach or fabric softener compartments. If the water inlet valves are opening water would flow into the tub only thru the wrong compartment.
Things to try:
1. verify your water hoses are flowing water by removing them from the back of the machine and running each into the drain pipe
2. reconnect the hoses and verify the water valves are fully open
3. run all the different cycles and different water temp settings
4. while running all the different cycles open the dispenser tray slightly to see if any water is passing thru
Also while performing the checks, leave the top off the machine and watch to see if the dispenser switch arm moves. If not it may need replaced and if it isn't switching to the correct position may cause the water not to turn on. Try helping it move a little by hand when you hear it clicking.

If no water flows with any of the tests and you have installed a new water inlet valve assembly and the dispenser switch is working, then I suspect either the wiring isn't making a good connection or your electronic control board is bad.