My 1999 Audi A4 Q, wouldn't start yesterday. I thought the battery was drained, although I didn't know why, and I got a jump. The car started but every time i turned it off, it wouldn't start, even after a long drive. But then i tried it again on its own, and it started. When i try and start it, the dash lights come on and the battery gauge goes up and there is a clicking sound, but it doesn't start. Could this be a loose starter? and if so, how do i tighten it? Thanks so much for any help.