"David Combs" wrote in message
...
The question comes down to: none of them shows red, none is clearly
positioned differently from any other one on the board -- yet a
circuit (upstairs) is dead.

What might be the problem?


How to troubleshoot it?



This problem has been discussed many times in this group. Do a search.
There may be a broken or burnt off wire somewhere. A loose connection. A
bad circuit breaker. It could even be something as simple as a tripped GFI
receptacle if it is a bathroom or outdoor circuit. You would need to
starting taking things apart to find the problem beginning with your circuit
breaker panel.