Reconnected battery...car wont start now

[tico481]

I had to disconnect the battery cause a screw fell behind it and had to get it out so I took it out, then reconnected the battery and now when i try and crank the car, it wont start. When I turn the key, the radio and all the lights work but the engine wont even attempt to turn over. Is there something I need to reset or what? Any help is greatly appreciated and asap! I absolutely have to have my car working tonight. Thanks in advance.

[TMac325is]

your battery got discharged. it doesnt take much to discharge some of these bmw batteries

all you have to do is jump start it, or use a boat battery charger and hook it up

if you have a stick and some friends around you can push start your car, i did it the other night. put the car in first, take parking brake off, push in the clutch, have your friends push your car forward down the street 5-10 mph, turn the key and let out the clutch, car should start depending on how dead the battery is

your best bet it jumpstarting, and taking it for a spin to recharge

[97alpineM3]

Does your radio say.... something about a code... or do you have an aftermarket radio... that might do it...

[Furious]

is its an OEM battery?

[tico481]

Yeah, it's an OEM battery. And I thought it might be the security code but it hasnt been set or anything. Could the OBC been reset when i disconnected the battery and set a default code or something? Cause I tried to jump start it and it still wouldnt work.

[Speedy-325is]

the proper push start "bump start" is not done in first gear. it is harder on the car/people.
do it in second or even third. reverse is good also.
first is too small a gear, 2nd is nicccceeee!

did u disconnect it properly, maybe short it out?
how old is the battery? go get it tested, its free!
Mark

[CNOBLE222]

i have a 94 e34 chassis 525i and i have a problem doors want unlock like normal and windows dont work car starts every once in awhile and the flashers come on by there selfs what could this problem be

[brucie]

how long did you have the battery disconnected for, was it only a matter of minutes, if it was, disconnect the battery again, this time leave it for about half an hour, while its disconnected put your foot on the break pedal for about 30 secs or so to make sure the electrical system is completely drained, then re connect the battery and try again, have heard that if the battery is disconnected and the electrical system hasnt had enough time to drain that this can cause problems with the ecu, not bad but it messes about with the memory of it and can cause the engine override to kick in, therefore not allowing you to start the engine
try it, if not that try the keyfob and make sure you are locking and unlocking the car as it should, maybe the immobiliser hasnt switched itself off