Car won't even jump start!?

Sounds like it is your battery. When a battery is drained down, that means each cell does not have enough power in them and jumping it with cables is not a long enough time to get enough power to engage the starter. It takes a minimum of 2 hrs to fully recharge a battery @ 10 amps charging rate. Make sure the drive belt for the alternator is at the proper tension. If it is too loose, the alternator is not turning fast enough to provide power to run the electrical system and recharge the battery. When you press on the alternator belt, there should be +/ - 1/4in play in the belt. Before doing anything, check the fluid level of each cell. If it is a sealed battery, you may have to get a new one.