My brother and electrical things

Okay. I know I am posting too many times today. Over-active synapses on a Sunday.
But that might mean I can have tomorrow off, right?
Anyway, strike while the metal is hot and all. This just came to me.

My brother comes home every once in a while. Now he's a nice guy and all. I like him. And he seems pretty competent in his job and everything.
But every time he comes home, he manages to screw up some piece of electronic equipment in a way that no technician or engineer can seem to repair.
"I don't know. You'll just have to throw it away and buy a new one" they invariably say.
Last time it was my Mum's computer. She hasn't been able to connect to the internet for weeks.
So I went up and looked at it tonight.
Right enough it wasn't working. So I had a look in the back. Everything seemed Okay. So I just pulled out a couple of cables and stuck them back in again. Hey presto! Internet working again!
I don't know what it is with my brother. I mean the guy has a highly reponsible job. I don't want to worry you frequent fliers, but his job involves practically running an airport. Can you imagine him wandering into the air-traffic control tower and saying, "What  does this button do?"