Car won't start
 

I'm pretty sure its the battery but the Alternator has me worried I guess. Anyways I tried starting it up today and it turned over and no more than 5 seconds the car died. Now its happened before I gave it a second and then tried it again. This time it didn't even turn :cry: none of the lights in the car but the Anti-theft work, power locks don't work, the only thing that does is the annoying sound it makes when the key is in the ignition.

What do you think? Bad battery or bad alternator? The battery was changed out about 2 years ago, and the alternator is still original. Car never has any problems while on the road either.