I disconnected the negative battery cable to change the cluster gears in my automatic 1990 bmw 325i sedan. Once I was done with the work, I reconnected the battery, but when I go to start the car it won't start. It clicks and the dash lights up, with the radio saying to enter CODE, then I pulled key out and hazard lights starts to blink for maybe 30secs and shuts off, and no alarm sounds go off. When I saw the CODE on the radio, I entered the 5 digit code and radio works displaying the station, but car still wont start. I've Googled and searched just about as many bmw forums I can find, but it was mostly for E34s saying to disconnect negative for 5 minutes & try to start again, but that didn't work. Then I saw to connect battery (which I left disconnected overnight since it got late), put key in position 1 and wait for clock countdown. Clock never counted down on my radio, just says CODE, which I put in the 5digit radio code again, car still won't start. It's a 6mo old battery and was working perfectly fine until I disconnected it. Anyone have any ideas?