Well to start the story my alarm was going of so it drained my battery.Every thing was fine but the battery so then i replaced the battery for a new original battery.Then when i did that now my navi screen dont want to go on it just kind of flashes for like a split second but no picture also my radio turns of radio when he wants :mad help me please

When the battery is replaced, care needs to be taken that the red LED light on the front of the NAV unit goes out before disconnecting the battery. If you don't let the NAV unit power down totally, you could fry your NAV unit. Hope this isn't your case. I'd try again, letting the red LED power light go out, then disconnect the battery for 15 minutes to kinda of "reboot" the system. Hope this helps.

I am new to bmw or a newbie so i need help on this thank you very much :redspot

I am new to bmw or a newbie so i need help on this thank you very much
Just to be sure, are you saying you still need help, as in how to try the disconnect battery thing, or are you doing OK? Just let us know. :buttrock

i did that and it still not good thank you bro but i think im screwed :alright