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.
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