okay so i was driving today and went over an intersection hill while giving my car some gas and the entire car just shut off once it went over the little hill in the intersection. i tried starting the car back up but there was nothing. no turning at all. there is no power whatsoever and im not sure what is wrong with it. a guy saw me looking at my battery and tried to jump it buuut when he put the negative cable on the battery terminal it started sparking real bad. he thinks i have a dead short somewhere in the wiring. i eventually had AAA tow my car back home (no shops are open today) and the mechanic who towed it said the same thing. have any of you had a problem like this? and if so do yall know around how much it would cost to repair?