I got back from a trip and my car wouldn't start.  It makes a very
quick repeated clicking noise.  I think it may be the starter.  My mom
noticed that the trunk was left open, and closed it a couple of days
after I left.  The lights work just fine.  I tried a battery charger
briefly and amp reading was fine.  (The battery charger is kind of
old.)  I still haven't tried jumping it.