from a mechanic -
It is possible that the battery has bad cells which will prevent the car from starting, even when using jumper cables. The battery, starter, and alternator work closely together and because of that, it would be necessary to have each inspected to ensure they are working properly.
There have been so many battery issues here, it wouldn't surprise me one bit. I think I've only seen one person have issues with a starter. Absolutely countless threads on battery issues and endless battery replacements under warranty.