Will start with help

My 2008 CE will start with a jump start, but won't restart. When it is running, there is no clock or radio. The battery is not even a year old. I'm thinking it might be the alternator.
What do you guys think?
If you have a volt meter you can check to see if it is putting out enough power. You can check at the battery. With the car running the meter should read at over 14 volts.
Bring your car to a nearby auto parts store. They will check your battery for free. If it's a bad alternator, your car will die in a few minutes since it main function is to recharge the battery.