turn on key - complete power loss
I drive a 2000 528i. this has happened twice now in the last week. I get in, turn key to start car, everything lights up as it should for about half of a second then everything turns off, complete power failure. I disconnected the negative battery terminal, let it sit for a few minutes, reconnect the battery and retry the start and everything lights up and the car runs normally. My TRIP has reset, the radio has reset, so there was a complete loss of power to the entire car, but whatever it is is resetting itself possibly because i disconnected the battery, but maybe it is resetting regardless of my battery manual disconnect.