What causes a black screen and where to start
A black screen usually means one of three things: the monitor is off or disconnected, Windows is running but the display won't wake up, or the computer itself has stopped working. The fastest way to find out which one is happening is to listen and feel. If you hear the computer fan running and the power light is on, your machine is working — the problem is the display. If everything is silent and dark, the computer itself isn't starting.
Start by checking the simplest things first. Make sure the monitor power cable is plugged into both the wall outlet and the back of the monitor, and that the power button on the monitor itself is pressed. Look for a power light on the monitor — it should be white, blue, or green. If the monitor has no light at all, try a different outlet to rule out a dead power strip.
Next, check the cable connecting the monitor to the computer. On most desktop machines, this is an HDMI cable, a DisplayPort cable, or an older VGA cable. Unplug it from both ends and plug it back in firmly. If you have a laptop, skip this step — the screen is built in and won't disconnect this way.
Key Takeaways
- A black screen with a working fan and power light means the computer is running but the display isn't responding, which you can often fix by restarting or adjusting power settings.
- Check that the monitor power cable and video cable are both plugged in firmly, and that the monitor's own power button is on.
- If the computer is completely silent and dark, hold the power button for 10 seconds to force a shutdown, then press it again to restart.
- On Windows, pressing Windows key + P can wake a sleeping display or switch to a different monitor if your computer is running but the screen is off.
- If the screen stays black after a restart and you hear beeping sounds, the computer is signaling a hardware problem that may need professional diagnosis.
Restart the computer when the fan is running
If you can hear the computer working but see nothing on screen, the machine is probably stuck or the display has gone to sleep. Press and hold the power button on the computer itself for 10 seconds. This forces a shutdown even if Windows is frozen. Wait a few seconds, then press the power button once to turn it back on.
Watch and listen as it restarts. You should see the manufacturer's logo appear on the screen within a few seconds — Dell, HP, Lenovo, or whatever brand you have. If you see that logo, the computer is working and Windows is loading. If the screen stays black, move to the next section.
If you have a laptop, the power button is usually at the top corner of the keyboard. Hold it down for the full 10 seconds even if the screen flickers or you see a shutdown menu — the goal is a complete force-off.
Wake the display with keyboard and mouse movement
Sometimes Windows puts the monitor to sleep while the computer keeps running. The screen looks completely black, but the machine is just waiting for you to do something. Move your mouse or press any key on the keyboard. If the display wakes up, you're done — it was just in sleep mode.
If moving the mouse doesn't work, try pressing the spacebar or Enter key a few times. Some computers are set to require a keystroke rather than mouse movement to wake up. If you have a laptop, try opening the lid if it was closed, or pressing the spacebar.
Use Windows key + P to switch displays
On Windows computers, pressing the Windows key and the letter P at the same time opens a display menu, even if you can't see it on screen. This menu lets you switch between your monitor, a projector, or an external display if you have one plugged in. The computer might be sending video to the wrong output.
Press Windows + P, then press the right arrow key or down arrow key to cycle through the options. You should hear a sound or feel the keyboard respond. Keep pressing until the image appears on your monitor. This is especially common if you recently unplugged a projector or second monitor.
If you're not sure which key is the Windows key, it's usually at the bottom left of the keyboard, between Ctrl and Alt, and has a Windows logo on it.
Check for beeping sounds and what they mean
If the computer is making beeping sounds while the screen stays black, the machine is telling you there's a hardware problem. Different patterns mean different things. One long beep followed by two short beeps usually means a memory problem. Continuous beeping often means the power supply is failing or something is overheating.
Beeping codes are the computer's way of communicating when it can't display anything on screen. Write down the pattern — how many beeps, how long each one is, and whether there are pauses between them. This information helps a technician diagnose the problem if you need to take the computer in for repair.
If you hear beeping, the computer itself is working but something inside needs attention. This is not something you can usually fix at home without opening the case or replacing parts.
Restart in Safe Mode to rule out software problems
If the screen is still black after a normal restart, try starting in Safe Mode. This loads Windows with only the most basic drivers and programs, which can help you see whether a recently installed program or driver is causing the problem.
On Windows 10 and 11, restart the computer and when ready start pressing the F8 key repeatedly as soon as you see the manufacturer's logo. Keep pressing until you see a menu with options like "Safe Mode" and "Safe Mode with Networking". Use the arrow keys to select Safe Mode and press Enter. The computer will take longer to start and the screen may look different, but if it works, you know a program or driver is the problem.
If Safe Mode also shows a black screen, the issue is with Windows itself or the hardware, not a program you installed. At that point, you may need to reinstall Windows or have the computer checked by a technician.
What to do if nothing works
If the screen is still black after trying all these steps, the problem is likely a hardware failure. Common causes are a dead graphics card, a failing power supply, a disconnected internal cable, or a broken monitor. These are not things you can fix without opening the computer or replacing parts.
Before taking it to a repair shop, try one more thing: unplug the monitor completely for 30 seconds, then plug it back in and turn it on. Sometimes a monitor needs to reset. If that doesn't work, the monitor itself may be dead and you may need a replacement.
If you have a second monitor or TV with an HDMI input, try connecting your computer to that instead. If the image appears on the second display, your original monitor is broken. If the second display is also black, the problem is inside the computer.
Frequently Asked Questions
Why is my screen black but I can hear the computer running?
The computer is working but the display isn't receiving a signal. This usually means the monitor is off, the cable is loose, or Windows has put the display to sleep. Try pressing a key or moving the mouse first, then check that the monitor power cable and video cable are both plugged in firmly.
Can I fix a black screen without restarting?
Sometimes. Try moving your mouse, pressing a key, or using Windows + P to switch displays. If none of those work, a restart is usually the next step. Hold the power button for 10 seconds to force the computer off, then turn it back on.
What does it mean if my computer beeps while the screen is black?
Beeping is a hardware error code. One long beep and two short beeps usually means a memory problem. Continuous beeping often means overheating or a power supply issue. Write down the pattern and take the computer to a technician — this is not something you can fix yourself.
Is a black screen a sign my computer is broken?
Not always. Most black screens are caused by a loose cable, a sleeping display, or a software problem that a restart fixes. Only if the computer is completely silent and dark, or if it beeps with an error code, is there likely a hardware failure inside.
Should I try opening the computer case to fix this myself?
Only if you're comfortable working with electronics and you've already ruled out the straightforward fixes — loose cables, monitor power, and a restart. If you're not sure, take it to a repair shop. Opening the case can damage components if you're not careful, and it may void your warranty.