
Originally Posted by
SideShow Bob
You don't need to shut off the main breaker, uless you just want the whole house dead.
Shut off the breaker for that circuit, check with a meter at the breaker where the wire goes in if no voltage, tighten the screw.
go to the rooms and check each outlet with a meter before working on them. Carefully remove switches and check with a meter before working on them, and the same goes for the light fixtures.
You will most likely find one or more places where the loose connection(s) have arced and caused burns or heat discoloration.