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It sounds like you might have a bad alternator. You can't always trust you gauges. Jump it off again and check the voltage at the battery. You should have 14 volts. If it is less then that you have a bad alternator. Good luck.
If the car doesn't start with a jump you might have a bad alternator. The alternator supplies voltage to the car once the engine is running. If the battery is dead, and the alternator isn't putting out sufficient voltage, the engine cannot run. Then again sometimes a car with an extremely dead or internally shorted battery WON'T start with a jump. Replace the battery and try again.