my c230 was not driven for about 4 weeks and i believe the battery went dead. Nothing was wroking(alarm, lights, etc). I tried to jump start the car but was unsucessful. When I hooked up the jumper cable from my frind's car to mine, the lights came on and others(window, stereo) seem to work. When I turn my key to start it, it just makes strange noise and won't start. What can I do to get out of this trouble? Bad ignition? Loose conncetion? thanks for your help.

ps: i heard placing shift gears in different position can help??