What caused my servo to burn out?
(EDIT: This answered OP's original title question, which was "What happens if you use a load that exceeds the maximum regulated current output from your power supply?")

As for the power supply overload question, it depends on the power supply. Some behaviours include:


latching the output off
reducing the output voltage while keeping the output current constant
hiccupping (switching the output off and on)
going into thermal shutdown with autorecovery
blowing a fuse
blowing up


It will all depend on the power supply itself and the nature of the overload.