When I turn the key in the ignition, the lights in the car go on, radio etc. But the car will not start. The lights flicker as if the battery is running out of juice. The battery is 2 wks old. There is no clicking, no sound. The car has over 100,000 miles. Please help, as this is the only vehicle my family has, and need to have it running for work.

sounds like the charging system is not working. start with that and let me know.