---
title: If something goes wrong
order: 90
---

Almost nothing here needs a technical person, and nothing you can do
from the keyboard will break the computer.

## The screen is black

Move the mouse or press a key. If it stays black, check the television
is on and showing this computer.

## A window will not close

Click its button on the bar to bring it back, and close it normally.

## The bar has gone

Wait a few seconds; it puts itself back.

If it does not, switch the computer off at the power button, wait ten
seconds, and switch it on again. It comes back to the same screen it
always does.

## Something asks for a password

Nothing a teacher needs to do asks for a password. If a password box
appears, you have reached something you did not mean to — press **Esc**
or click **Cancel**, and carry on.

## It is still wrong

Tell the office, and say **which room** and **what you were doing when
it happened**. That second part is the one that saves everybody time.