Help how to start to troubleshoot bosch

My dishwasher does not turn on at all, have checked power to dishwasher, and power is on. On/Off switch does not turn power on. Worked fine a day ago and have not problems since purchased. How to I begin to troubleshoot?

Hi,

If you have already check power were it enters the dishwasher then I would take a look at the door switch next.