First thing I'd do is verify you have power to the unit. If not could be a tripped breaker or a wall switch (some houses are built with a wall switch to control power supply to dishwasher so you could turn them off if you received a phone call on an old style phone in the vicinity - I've seen rental units where occupant didn't realize this and simply had to turn the switch on). Best way to check for power to the unit is with a circuit tester or multimeter at the junction box behind the tow kick where electrical connection is made. If you have power there but still no lights and are comfortable with repairs I'd pull the front door panel off and start there armed with a circuit diagram and multimeter. Things to look for would be failed on/off switch, failure of "door closed" limit switch, control board failure (if it's a relay on the board and you know how to do this replacing failed relays is cheaper than replacing entire control boards).