Sometimes when I plug my filters ( 2- Aquaclear 60's) back in, they won't pump water either. My motors are working but the impellers just won't spin. If that's the case with yours, it's an easy fix. I just move the intake tube to the side so that I can see into the motor and impeller, and use a wooden skewer or my planting tweezers to give the impeller a small nudge, and that gets it spinning. That I get the intake tube back into place and I also fill the filter 1/2 way with tank water. Make sure you're never running your filter without water in it, that's a sure way to burn the motor. Help this helps!!!!