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A very important installation trick that is commonly overlooked is the correct routing of the dishwsasher drain hose to the sink drain or disposal. As the hose exits the sink drain or disposal it is necessary to loop the hose up higher than where it is exiting out of and only then go down to the dishwasher sump. Failure to follow this proceedure will cause a mixture of dirty drain water, dish soap and or disposal debris to siphon this pollution into your dishwasher sump.
It could be the impeller on the motor. The impeller fits over the shaft of the motor and might have split/broken up. That funny noise is probably the shaft spinning inside the damage impeller. Fortunately the impeler is fairly inexpensive and easy to replace. I believe there are one or two parts/covers to remove that are held in by a roughly half dozen torx screws.
I had this same problem. I think its the upper spray arm vibrating during wash cycle. To verify; prevent the upper arm from rotating by putting a long spatula through the top rack or zip tie the arm so it don't rotate. If the noise goes away you found your problem.