Gary, once I had to force a reboot (can't recall the reason off hand) and by natural reflex I did it the way I used to do with one of the iMacs I had.
By holding down the cmd + option + power. It worked.
Yet if I recall the other iMac I had those key combinations wouldn't work.
So I suppose it was either sheer luck or hit and miss.
Sense I've read that all one needs to do is hold the power button down for a few seconds or so.
Probably other ways for shutting down (other than the norm) but to pull the plug,I've heard that's a no-no for hardware damage. Try all other options first before resorting to the kill-Switch method.
