A computer that refuses to turn on is one of the most alarming experiences in tech. One moment it was fine; now there’s nothing, just a black screen and silence.

Before you panic, it’s worth knowing that the vast majority of these situations have a simple explanation and a straightforward fix. Here’s how to work through it.

Start with the basics

It sounds obvious, but power problems cause more “dead computers” than anything else.

Check the cable. If you’re on a desktop or laptop plugged into the wall, trace the cable from the computer to the socket. Is it fully seated at both ends? Is the socket itself switched on? Try a different socket.

Check the laptop battery. If you’re on a laptop, plug it in and wait two minutes before trying to turn it on. A completely drained battery won’t boot instantly, it needs a moment to accept charge first.

Check the power strip. If your computer is plugged into a multi-socket strip or surge protector, check that the strip itself is switched on and that it hasn’t tripped. Some strips have a reset button.

Try the power button again. Hold it down for five full seconds. Some computers require a long press; a brief tap doesn’t always register.

If there’s a sign of life but nothing on screen

If you can hear the fan spinning, or see a light on the machine but the screen stays black, the computer is receiving power, the problem is likely the display rather than the machine itself.

On a laptop: Try adjusting the screen brightness using the brightness keys (usually Fn + a function key). Some laptops go dark instead of sleeping.

Try a key press. Press the Space bar or Enter once. The computer may have gone into a deep sleep mode rather than turning off completely.

External monitor (desktop): Check the cable between the computer and monitor. Try turning the monitor off and back on. Check that the monitor is set to the correct input (HDMI, DisplayPort) using its own menu button.

On a Mac: If you see the Apple logo and a loading bar that gets stuck, this usually means the operating system is struggling to start. Hold down the power button to force it off, wait 30 seconds, then try again.

The restart trick

If the computer is on but completely unresponsive, screen frozen, nothing moving, a forced restart often fixes it.

Hold down the power button for eight to ten seconds until the computer switches off completely. Wait 30 seconds. Then press the power button once to restart.

This is safe to do. You may lose any unsaved work in open documents, but the computer itself will be fine.

Check the battery (laptops)

Over time, laptop batteries degrade. An old battery may show 60% charge but actually have very little capacity left, meaning the laptop dies or won’t start even though it thinks it has power.

If your laptop only works when plugged in but dies immediately when you unplug it, the battery likely needs replacing. This is a common and relatively inexpensive repair, worth doing if the rest of the laptop is in good condition.

When to seek help

If you’ve tried all of the above and the computer still won’t start, it’s time to bring it to someone. A few signs of what might be happening:

Clicking or grinding noises when you try to start it, this can indicate a failing hard drive. Stop trying to turn it on and seek help promptly; some data recovery may still be possible.
Beeping sounds on startup, different patterns of beeps mean different things depending on the manufacturer. A repair technician can interpret these.
The screen shows an error message before going blank, photograph it on your phone and bring the photo with you.
It happened after a power cut or surge, a surge may have damaged components. A surge-protected power strip helps prevent this in future.

Before you take it anywhere: write down what happened

The more you can tell a technician, the faster the diagnosis. Note:

When you last used it successfully
Whether anything unusual happened before it stopped (strange noises, slowness, an update)
What happens when you press the power button now (lights, sounds, nothing)
Whether it’s under warranty (check the original box or receipt)

If you’re in the Hebden Bridge area and your computer has stopped working, we’re happy to take a look with you, no pressure, no jargon. Sometimes it takes five minutes; sometimes it’s the start of a longer conversation about what to do next.

Get in touch and we’ll find a time that works.

What to Do When Your Computer Won't Turn On