I tried to install an aftermarket stereo while i was doing this i tried to turn on the car so that the battery would not die but when i turn the ignition i heard a weird electric sound coming from somewhere around the battery and the car did not start. also that beeping sound you hear when you leave you headlight on or the key in the ignition its always on. i checked all fuses and the all fine. i jump started it and it did worked bu when i turned it off and tried again it would not start.