Re: "The power lead approached the PC..."
I too have blown a power supply with the 110-240V switch. The computer was misbehaving for some reason and I decided to try a proper cold start by shutting it down and turning the power off and on again. The previous machine had a physical on-off switch next to the power cord. I located the switch on this one by feel, but there was no power switch, only the 110-240V switch. My subconscious was too stupid to ask "Why is the switch so small?" Bang!