2000 chevy malibu ...car won't start. I have a two month old battery. When the car is off, after I tried to start it, I can still hear a buzzing noise in the dash behind the stereo. The serpintine, drive shaft belt recently broke and the pulleu was broke... they were both replaced....three days before it wouldn't start. yesterday it was starting with a battery jump.

Check the voltage to battery. battery voltage at battery should be be at least 12.6 or higher with car off. when running at battery should be at least 14.1 to 14.7, try this. get a jump start, then while running disconnect the negative cable to battery. car chould still run. but if it quits when disconnecting negative cable then you have an alternator problem. or the belt.