RE Teacher (also headteacher) realized the sound isnt working
Student (not me) goes and tries to sort it out
Eventually technician is called.
Technician finds out the speakers' cable is in the microphone slot XD

One time, a school consoler was showing us a video and thought the video was the Internet Explorer 8 intro video. >.<

@UBERNESS
What was the video actually?

@Ace
Sort of an SAT (ACT) intro video.

One of my friends at school said that he couldnt find his documents after they upgraded from XP to 7

i said to him. press the flag and then press Documents.

Then he replied with

BUT I WANT MY DOCUMENTS!!!

me4502:

BUT I WANT MY DOCUMENTS!!!

LOL FAILURE

Mine isn't actually funny, but hey, I tried.

At computers at school, we had to draw something in paint. I was drawing perfektly :) but some one else was like this:
Him: How do you draw?
Me: Click that button over there and move the mouse while having the button pressed
Him: What's the mouse?
Me: It's that thing over there

-He tries to draw something-

Him: It doesn't work!
Me: That's because you clicked the word button.
Him: What's a word button?
Me: -Facedesk-

And another one, the teacher allowed us to play some internet games while she was doing something
Me: -Clicks on IE, makes stuff and is already playing a game in less then 10 seconds-
Someone: How did you do that?
Me: Do what?
Him: Open that thingie
Me: You mean IE?
Him: What's IE?
Me: Internet Explorer
Him: What do you do with it?
Me:You browse the internet
Him: What's the internet?
Me: -Facedesk-

Here's one I invented:
Teacher: Open your computers
Me: -Opens computer-
Someone: Uhh, how do you open this thing?
Me: T_T, press that button over there
Someone: But what do the other buttons do?
Me: Doesn't matter, just open the computer
Him: I want to know what they do!
Me: OPEN THE FRIGGEN COMPUTER!
Him: How do you do it again?
Me: -Facedesk-

And another, but not PC, mobile phone.

Old lady wonderign around in phone store.
Seller: Can I help you, miss?
Old lady: Huh?
Seller: Do you wish to buy something?
Old lady: Yea, some fruits
Seller: -Facepalm- This isn't a fruit store, it's a phone store
Old lady: What's a phone?
Seller: -Facedesk- It's something you can talk with other persons with
Old lady: Why do I need that?
Seller: I just told you...
Old lady: No, why do I need a phone to talk to someone? I do have a mouth, don't I?
Seller: It's used to talk to people that aren't next to you....
Old lady: I can shout.
Seller: ...MEANING, for example, a few miles away.
Old lady: How the heck am I supposed to shout that loud?
Seller: You're not.
Old lady: ???
Seller: You use the phone
Old lady: What's a phone?
Seller: -FACEPALM- -HEADDESK- -FACEDESK- -HEADBRICK- -HEADPHONES-

I think that a few of these are made up...

My friend thought that the 0 was on the left side of the keyboard :D.

I think this thread is evil, it makes me lose so much faith in society that people can be THAT backwards. A smart person should be able to figure out how to use a computer without ever seeing one before, how do you we learnt when we were 5, did we just sit there looking at it going how do I use this? NO we tried random shit till it worked! People should be able to figure this out and I feel sad that people can't.

P.S. Stop making these up, some are just too outrageous!