xx 740i - Reset the multi function display.

My BMW is 2001 740i manuf date 9/200.

After disconnecting the battery to change the oil cover gasket, the monitor above the AC is locked. Please help. Any lead is appreciated.

A "xx 740i" could be any e38 740i model year except 1996 (no SWB 740i models were imported that year)...and the term "multi-function display" could refer to either the MID (multi-informational display) or Nav monitor...because they both do multi-functions and both sit "above" the AC (IHKA) panel.

Help us help you better and be a little less vague in the description of your issue and car info. When forum members aren't sure as to what you are referring to or what model year (due to different component set-ups & options)...many times you end up with a thread that has many "views"...but few "replies"...because they don't know how to respond.

A generic suggestion would be to check all fuses for which ever set-up you have. Removing & replacing the battery cables could have sent a power surge thru the electronic system and blew a fuse. The major electronic component fuses are located in the engine bay & trunk (above the battery). Each location has a fuse index & chart that indicates what the fuses do and the fuse number & amperage...and the illustration shows the location of each fuse in each fuse box.

Thanks QSilver7 for your advice. My BMW is 2001 740i built in 9/2000.
I disconnect the battery terminals to change the gasket of the oil covers but I forget to disarm my lock code. After I complete the gasket job, I connect the battery. The alarm goes off. I disarm it with my car key. I cannot start my b/c the security code is still active and the NAV screen does not display the screen to enter the security code (but the neon backlit light is on, the phone button does work and the radio is working). In the past, when I replace the battery, the display comes right back after the ignition key is turned on. I have to use the emergency start procedure to reset my security code by 1) disconnecting the battery for 5 min.; 2) reconnecting the battery and 3) then turn on the ignition to position 1 for 10 min. I can start the car after the reset of the security code. Thanks for your advice of the fuses. I did not think of the fuses. I will check them tomorrow. It is late now. I will post after the findings. Many thanks QSilver7.