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My wife and I purchased a new 2013 C-Max SE this past Friday. We drove it Friday (it was awesome), Saturday (awesome), then on Sunday I wanted to show my wife the air intakes behind the rear passenger seats so she would know to not put anything over them since that is where the air intake to cool the High Voltage Battery is located. I reached down and pulled the switch to open the hatchback and nothing happened. I thought, that's odd, but passed it off as it being an electric lock and the key needing to be in the ignition, not remembering that the key has a button to open the hatch and the car was unlocked. Later we got in the car to go out, my wife put the key in the ignition, turned it to start and nothing. Then I noticed that nothing electrical was happening anywhere in the vehicle. I dug out the manual, wondering if the crash fuel shut off switch had malfunctioned or as I read later, the High Voltage crash shut off switch. I didn't immediately find what I was looking for in the manual. So, I called Ford Roadside Assistance. They were polite and offered to send a tow-truck but had no information to diagnose what was wrong. I grabbed my portable jump start unit, attached it to the + terminal on the 12VDC and grounded it away from the battery. As soon as I turned the switch on the jump start unit to on all the power on our C-Max came on, the head lights, the radio, the dome lights, the instrument panel, everything. I immediately turned the jump start unit off and disconnected it from the car. I looked at the HV battery gauge and it showed 2/3 full. No other indications were given before or after this problem. It seemed to me as if the jump start unit caused a reset of whatever system feature that had disabled all electric power in the vehicle. I put the jump start unit in the storage area, just in case, and we drove it without further incident. Today I took it into the dealer and it is there with a laptop connected to it for diagnostics. I found this website/forum and found a post that was almost identical to mine where both the 12VDC battery and the instrument panel were replaced, which apparently solved the problem. More to follow.