Fixing
When something goes wrong: what to try, in order
Nearly every ordinary computer problem responds to the same four steps, tried in the same order. Knowing the order saves the panic.
Published 27 July 2026 · Updated 10 September 2026
A frozen program
A program that stops responding often recovers if left for a minute. Clicking repeatedly makes it worse by queuing up more work.
If it does not recover, it can be forced to close: Ctrl, Shift and Escape together opens the task manager, where the program can be selected and ended.
Closing one program does not affect the others. Unsaved work in that program is lost, which is the argument for saving often.
A slow computer
The usual cause is a full disk. If the drive is more than about ninety per cent full, everything slows down, and clearing space fixes it.
The second cause is too many programs starting automatically. The task manager's startup tab lists them and they can be disabled safely.
The third is a browser with forty tabs open. This is the most common cause on modern machines and the easiest to fix.
Restarting properly
Restart is not the same as shutting down and starting again, on some systems. Where both exist, choose restart.
It resolves a remarkable proportion of problems because it clears everything that has got into a stuck state.
A computer that has been on for weeks accumulates problems. Restarting once a week is a reasonable habit.
Messages you do not understand
Read the message before dismissing it. Most say what they want, and most are asking permission for something.
Write down or photograph the exact wording. “It said something about an error” is not enough for anyone to help with; the exact text usually leads straight to the answer.
A message that appeared while you were only reading a web page, and that wants to install or scan something, should be refused and the page closed.
Nothing on the screen
Check that the monitor is on and that its cable is seated at both ends. This accounts for a startling share of dead computers.
On a laptop, check the brightness has not been turned to zero with the function keys.
If there is a light on the machine and fans are running but no picture, the problem is the display or its connection rather than the computer.
It will not start
Check the power at the socket with something else. Then check the cable at both ends, including at the back of the machine.
On a laptop, remove the battery if it is removable, hold the power button for fifteen seconds, replace it and try again.
Beyond that, this is a job for a repair shop. Opening a desktop computer is not dangerous if it is unplugged, but diagnosing it without parts to swap is not practical.
Asking for help usefully
Three things make any request answerable: what you were doing, what you expected, and exactly what happened instead.
A photograph of the screen is worth more than a description. Any phone can take one.
Note whether it happens every time or occasionally. Intermittent problems have different causes and this is the first thing anyone will ask.
What not to do
Do not telephone a number that appears in a pop-up warning. These are fraudulent without exception; no legitimate company puts a support number in a browser message.
Do not grant remote access to anyone who contacted you first. Remote access is complete control of the machine.
Do not install a program that a warning message recommends. That is how the problem gets worse.
What this guide does not cover
Hardware diagnosis and repair.
Virus removal.
Data recovery from failed drives.
General information only. Menu names differ between systems and versions; look for the equivalent rather than the exact wording.