Is there power running to the dishwasher? If not, then
Check that it is plugged into the outlet (unless it is hardwired)
Check the breakers
Check any nearby GFCI outlets. Often electricity flows sequentially from one GFCI outlet to other outlets and/or appliances so if a nearby one has tripped it could cause power issues.
Are your dishes not being cleaned properly? If so, then
Check for food or debris at the bottom of the dishwasher. This could block the flow of water
Is there standing water or is the dishwasher not draining properly? If so, then
Mix together one cup each of baking soda and vinegar, then pour the mixture into the standing water at the bottom of the dishwasher. Let sit for about 20 minutes. If the water is draining or starting to drain at that time, rinse with hot water and then run the dishwasher’s rinse cycle. That may be enough to help loosen any clogs or debris that are preventing the dishwasher from draining properly.
Also ensure the dishwasher is clean and free of food and debris
A full garbage disposal or an air gap in a connecting hose can prevent water from properly draining out of the dishwasher. Be sure to enter the garbage disposal periodically.
Are there any leaks?
Check the door gasket. If it is damaged, you can swap it out fairly easily. Remove the old gasket by peeling it away from the door. Clean the channel with warm, soapy water. Warm the new door gasket with a hairdryer on low heat. Then, press evenly across the top and down both sides. Lastly, close the dishwasher door to seal the gasket tightly into place.
The drain hose might be loose or damaged. The drain hose feeds water from the dishwasher to the drain pump, drain line and eventually out your sink drain. Check your drain hoses to ensure everything is securely connected, including the clamps holding the nose in place on either side