Nissan Repair: Nissan 240sx no start, nissan 240sx, interior light

Question
I own a 1995 Nissan 240SX SE with 150,000 miles. I didn't drive it for 3 weeks and then when I went to start it up the other day, nothing happend. No lights, no radio, no sound when I turned the key. Is it my battery? It was running fine prior to when I parked it. Thanks for your input.

Answer
Karl,

Yes, the battery is dead.  First get the battery recharged adn checked for a dead cell.  If the battery is good put it back in and look for something that was left on like a door not being closed all the way or an interior light.  If you find nothing was left on then I would take the car to Autozone or Checker and get them to do afree electrical check to see that the alternator is putting out enough voltage to keep things charged.