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If you select a drain or spin program can you get it to start?
Do you have a multimeter or mains tester?
Sounds like you have blown the main pcb up when the power came back on or it caused the power to go out in the first place. Firstly take out the pcb and see if you can see any burn marks on it.
The fact that you have power to the frontal printed circuit board does not mean that all components upon it are functioning. I assume you have no error codes showing?
Does your display look like the attached --