Dishwasher not starting cycle

aslav...Does it do anything at all and how do you know it has power? Find and turn the breaker fully off and then on to reset it.

You don't say how old the unit is. If it has a mechanical timer, is it one you can turn? If so, turn it. If it starts to do something...this gives you an idea what's happening. Try a different cycle.

The first things a timer 'authorizes' in a dishwasher are: water in and start of pump motor. If neither is happening and power is on to the connection under the unit (use a voltage tester you get from the hardware store), then replace the timer. My bet: no power.

a dishwasher has a timer similar to a dryer you need a schematic so you can check the voltages at the heat cycle some times the timer goes out, and rarely the heating element or pump goes out. and make sure when you press start power travels through the button.