My wife was driving our 2008 Prius this afternoon and while at a long stop the car died. Display went black, never to come back on or show signs of life. We tried jumping it, nothing. Two different towing companies came out and plugged in portable jump starters, nothing. We tried the other key in case there was a signal issue with the key, no change. I checked the fuse in the car for the start system / display, it looked fine. Tried another fuse anyways, no change. Power locks work, interior lights work, brake lights and flashers work. From what I've read, the 12v battery causes a lot of problems but a jump start or portable charger should be able to get the car operating again. I'm going to start on it tomorrow morning and check the charge on the 12v battery, any other ideas besides that?