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Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now. Please give me time to respond as typing, researching and adding links takes me time to do so please be patient and often I will ask you questions to narrow down the issue to get is diagnosed correctly.
See if you have a siphon gap next to your sink as most times that will get blocked up with food and stuff causing the unit not to drain out properly. If you do not have one of those let me know if the pump on the dishwasher is running.
It would be hard to tell if the impeller is turning as you really can not get to it. Can you remove the drain line on your trap and see if any water pumps out of the machine or see if you can suck water through the drain hose with a shop vac...if you can not I would say the line is blocked. You can also remove the drain pump and see if the impeller is disconnected or broken off the motor shaft if you have the unit slid out, but I believe you have a blockage.