Not even at work for half an hour . . .

.
. . . and I've already spoken to the Idiot of the Day:

Luser: This computer you sent us won't power on.
Me: Check the back - sometimes there's a rocker switch on the power supply.
Luser: Where?
Me: On the power supply - where the round grill and the fan are.
Luser: There's no switch - just a hole with some prongs sticking out.
Me: You mean the receptacle where the power cord connects?
Luser: (long silence) Oh . . .

Sometimes you can actually hear them blush over the telephone.