Easy to miss something trivial
In the mid 80s the building manager of the big office building had gone on holiday, and had left detailed notes on how to work the terminal that controlled the heating, air conditioning, etc. of all the building.
I got called in because they could not get the instructions to work. The instructions said to connect by pressing Ctrl and C. So they pressed Ctrl. And then they pressed C.
Biting the hand that feeds IT
