I had a dental hygeinist phone in a fault on a Cavitron descaler. I took the call and knew the particular member of staff to be a bit absent minded. Iasked "Is it plugged in and switched on?" she went away ... checked ... came back on the phone and said yes, but its still not working.
So, i went over, checked it, it was switched on at the unit, and it was plugged in, but she had not switched on the power at the 13A socket.

I left her red faced.
