Arms on dishwasher won't move, no water com...

My dishwasher is making a grinding noise. I ran the dishwasher with the door open, and neither of the arms are moving. Water is coming out the bottom arm, but not the top, and neither of them will move. I checked the motor and it is moving. I have also taken off the filter and cleaned that out. Since I get water on the bottom, I would assume the pump is working, but again, the motor is making a funny grinding noise. I have checked installation and owners manual for my dishwasher and it couldn't be more useless. Do you have any suggestions??

I have a GE built-in dishwasher, model GSD3735FWW.

Thanks!!
Mo