A friend and I recently found this link: http://imgur.com/gallery/7a2S1, the important parts shown below.
It's about an IT-Guy who works at Hogwarts to install WiFi and stuff. But WiFi and computers require electricity. Would it be possible to install a power supply at Hogwarts, since it is invisible for muggles? Would electric devices even work? (We know they at the "current state" wouldn't
Also see How can electricity not work at Hogwarts?, but maybe that could be changed)
One of the posts says, he found a fully functional server room, aka the room of requirement. If he sets up the WiFi routers in there, what's gonna happen to all the PC stuff when he leaves/the room disappears? Would the signal vanish right after he leaves the room or would it, like in the post, hold on until the room takes on another form?
Screenshot from the link: