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I've had my alternator fail on a 99 Alero... thats probably your problem... I had to jury-rig the car to a marine battery with long jumpstart cables to get it to a dealer. I noticed it in the morning and after school the thing completely died in the parking lot of a gas station. If I were you, and had a spare battery laying around in fairly good condition and jumper cables, jumpstart the car using jumper cables and the spare battery and have the battery in the car with the cable coming under the hood to the inside of the car. this is assuming the car is driveable though. I'd suck it up and tell your mom the truth too. if you do take it to the dealer using that method, have ALL accessories OFF. this includes AC, Radio, and lights of any kind. Good luck man.