I remember once when I was working for a local council I had a similar issue, customers computer, their screen etc was off, came up with a few new power cables and that didn't fix the issue. Spoke with the user at their desk and asked if they had something I could plug in to see if the power bank sockets had failed, there was this heater she had under the desk and she switched it on and everything else came back to life.
That one made me laugh
Biting the hand that feeds IT
