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there is some kind of clog in the drain system. clean the screen in the dishwasher, there gets a build up of food, or misc stuff in there. it is probably draining, but slowly.
the dishwasher usually has a pump that pumps the water out with force, but if clogged it will be slowed down and when the cycle stops there will be water left in bottom
All power and sounds should stop when any dishwasher door is opened. Your door switch may be stuck causing it to continue. The 90 second sound at the beginning of the cycle is the water pump extracting any residual water before taking on clean water for the wash cycle. Any excessive noise from the drain pump could be debris in the pump. e.g. broken glass. You can remove the pump and check it for blockage or any foreign object.
when the water comes in to dishwasher the wash pump should start if you hear a hummimg sound it means that the wash pump is either blocked or the capasitor on the pump is faulty or maybe the pump it self needs to be replaced
If you post the model number of your dishwasher plus its approximate age (in years) I can help more.
But the most common cause is a weakening pump motor. On many dishwashers, the wash pump motor is also the drain motor. Replacing that motor / pump assembly will solve the problem. While you are replacing the pump, check the heating element to confirm that it is not shorted out or broken.
For now, add a cap full of bleach to the water _after_ the initial dishwasher fill cycle ends and the wash cycle begins. White vinegar would also work, but this will not fix your problem.
At the beginning of the cycle the dishwasher is attempting to pump out any residue water in the waste pipe and sump. It could be that the motor is sticking but you would probably also suffer from it not draining properly.
It may just be noisy pump. I have a similar model and it is also quite noisy but nothing extraordinary.
When the dishwasher is pumping out at the end of the washing cycle it may be quieter when there is water in the pump/pipes but then gets noisy as it 'pumps air'.