While looking up some information about this I stumbled across this... It's not entirely canon but it gives a good theory about why it is that wizards and witches might not use modern items.
From "When Magic Meets Muggle Technology" at Harry Potter Lexicon
Magic in the Harry Potter world is a power that wizards and witches
are able to harness and control by some innate ability. Magical
effects are often accompanied by lights, sparks, and sounds. The very
first magical effect that Harry performed in his new world was
shooting sparks out of his new wand at Ollivander's.
It seems to imply that magic effects the electro-magnetic spectrum in
some way. Some serious energy is being dealt with. A similar thing
happens when a nuclear device is exploded. A massive pulse of EM
energy is radiated out all over the spectrum. Radios cease to work.
Power lines arc. Telephones burn out. It is because of this chaos that
nations spend millions installing infrastructure that is immune to
this EM interference.
This might be why so many magical families are always baffled by Muggle technology, simply because such devices could not work well in conjunction with the magic they use in everyday life.
I also found this stating that there was a Computer in the Muggle Studies classroom. The wikia states that the devices do not work because they are powered by electricity.
Computers are one of numerous devices that do not work in magical
environments such as Hogwarts School of Witchcraft and Wizardry
because they are powered by electricity.
Harry Potter and the Goblet of Fire, Chapter 28 - (The Madness of Mr.
Direct quote from the book :
Harry had such a bad case of Twitchy Ears, he had to hold his hands
clamped over them as he walked away from the class.
"Well, Rita's definitely not using an Invisibility Cloak!" Hermione
panted five minutes later, catching up with Harry and Ron in the
entrance hall and pulling Harrys hand away from one of his wiggling
ears so that he could hear her. "Moody says he didn't see her anywhere
near the judges' table at the second task, or anywhere near the lake!"
"Hermione, is there any point in telling you to drop this?" said Ron.
"No!" said Hermione stubbornly. "I want to know how she heard me
talking to Viktor! And how she found out about Hagrids mum!"
"Maybe she had you bugged," said Harry.
"Bugged?" said Ron blankly. "What. . . put fleas on her or something?"
Harry started explaining about hidden microphones and recording
equipment. Ron was fascinated, but Hermione interrupted them.
"Aren't you two ever going to read Hogwarts, A History^"
"What's the point?" said Ron. "You know it by heart, we can just ask
"All those substitutes for magic Muggles use - electricity, computers,
and radar, and all those things - they all go haywire around
Hogwarts, there's too much magic in the air."