My dishwasher won't drain, do you have any suggestions?

Question

It was working fine until I had a person install a new garbage disposal. We have tried cleaning out the drain and removed all the debris as well as used a snake down the drain but still nothing!! I also used liquid drain cleaner.

Answer 1

WHEN THE DISHWASHER IS THROUGH      AND THE WATER IS STANDEING TRY TURNING THE DISPOSAL ON AT THAT TIME...SEE WHAT HAPPENS  

Answer 2

maybe the "person" installed it wrong

Answer 3

The G/D has a plug for the dishwasher that must be knocked out.