Diagnosis
You've got a dead control panel. This is almost always a failed electronic control board, which is the brain of this dishwasher. Power's getting to the unit, but the board isn't waking up.
How to Fix It
First, try a hard reset. Turn off the circuit breaker that powers the dishwasher for a full 5 minutes. Turn it back on. If that doesn't bring any lights to life, the main control board (Thermador part #00654530) is likely fried and needs replacement. You'll need to remove the lower kick plate and the inner door panel to access it.
If That Didn't Work
Check the wiring harness connection at the control board. Sometimes a connector works loose over time from vibration. Unplug and firmly reseat every connector you see.
Heads Up
Board replacements on these are a common but pricey fix. If you're not comfortable with disassembling the door, it's a pro job.