Just changed the garbage disposal and now this problem happened.
You said you installed a new disposal. has the dishwasher drain inlet knockout been removed from the disposal? This could be the reason all of a sudden the dishwasher is not draining especially if there is no air gap in the line. (the silver or white dome thing on the sink). If you don't have one then more than likely the dishwasher is connected directly to the disposal.
Check the dishwasher drain line, it may be clogged. You will probably have to pull the dishwasher out from under the cabinet to remove it and check it fully. If it still doesn't drain, it is then probably your drain pump. I just replaced one of these and it was pretty easy. I bought from appliancepartspros.com because of their good return policy and prices. They can also help you diagnose your problem.
Sounds like the pump is gone, or a blockage.
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