Power cable shutting amp down

Might be a loose connection at either end of the PC and your amp has a relay in its power supply?

I agree with Lewwhite. A short in the cable would cause your circuit breaker to trip first. So if not under warranty I would try and tightening the connectors at both ends.

I had the same thing happen a few years ago..The P/cord Manufacturer had used steel wool to clean off some burrs etc., and a small fragment of steel wool was left behind and was making contact ( internally ) and everytime I plugged the cord in it popped a fuse...As mentioned,you must have a bad connection or something broken off internally that making contact where it shouldn't be.......