I took my 2006 Prius on a trip and at some point I drove for about 15 miles in unpaved road. The road was not really bumpy but it vibrated the car a little. About 10 miles into the ride in the unpaved road, after I pulled over for a 1 hour stop, I started the car again and all lights and the combination meter (with the speedometer, gas gauge, gear indicator...) were not working. All warning lights were not working also, except the check engine light and the turn lights (other lights like high beam, tire pressure, cruise control would not light up again, even when the car was started when the usually flash for a few seconds). I reversed the car and the rear camera was not working either. The central display was still working though, but the Trip information was not displaying the fuel consumption and the mileage since last refill stayed stuck in 113 miles even though I drove for about 100 miles on the way back from the trip. In the middle of the trip I parked and the car would not power off and the key stayed stuck in the slot. I managed to drive the car back to my house, where it will stay stopped for now, and by chance the power button worked to shut down the Prius this time. I have a few questions related to those events:
Since it all happened at same time, are all those problems related?
How to force the car to shut down if the power button is not working? Disconnecting the negative terminal the battery will work or this would make any further damage?
How can I fix the combination meter and the power off button?
Can I used the Torque App with a Bluetooth OBD2 adapter to see the fuel level and mileage?