All of the sudden, my 2003 MC SS won't start. The engine doesn't turn over at all, the auto door locks/trunk release won't work, but I hear clicking (coming from everywhere!) and the dome light blinks rapidly. This happens when I turned on the headlights as well (to see if it was a battery issue). Unlike other posters, the security light isn't displayed -- just the yellow engine light for a few seconds. Advice?

 

Sounds like the battery is dead or you have a bad connection at the battery. With low voltage, relays tend to go haywire. Try cleaning the connections at the battery, if that doesnt work try jump starting it

 

Thanks labnjab-- much appreciated. I did try to jump it, but perhaps the battery was really low.