What causes a black screen and how to start fixing it
A black screen usually means one of three things: the monitor is off or disconnected, Windows is running but not displaying anything, or your graphics card or driver has failed. The fastest way to find out which is to check the physical connections first, then restart, then look at what lights and sounds your computer is making.
Start by making sure the monitor power cable is plugged in and the monitor itself is switched on — look for a power light on the front or back. If the monitor is on but still black, unplug the video cable (HDMI, DisplayPort, or VGA) from both the monitor and the back of your computer, wait five seconds, and plug it back in firmly. If you have a laptop, connect an external monitor to rule out a broken screen.
If the screen is still black but you can hear your computer running and see lights on the case, hold the power button for ten seconds to force a shutdown, then turn it back on. Many black screen problems fix themselves on restart.
Key Takeaways
- Check that your monitor is powered on and the video cable is plugged in at both ends before assuming the computer itself is broken.
- Force a restart by holding the power button for ten seconds, then turn the computer back on — this fixes many black screen problems without further steps.
- If the screen stays black but you hear the computer running, try booting into Safe Mode by restarting and pressing F8 or Shift+F8 repeatedly during startup.
- Outdated or corrupted graphics drivers cause black screens on working computers; updating or rolling back the driver often restores the display.
- If nothing works, a hardware failure in the graphics card or motherboard may require professional repair or replacement.
Check the monitor and cables first
Before you assume your computer is broken, verify that the monitor itself is working. Look at the front of the monitor for a small light — usually green when powered on, amber or red when in sleep mode. If there is no light at all, press the power button on the monitor itself. Many monitors have a button on the bottom or side, not just a switch on the back.
Next, trace the video cable from the back of your monitor to the back of your computer. The cable should be plugged into a port on the graphics card (if you have one) or the motherboard (if you do not). Unplug it from both ends, inspect the connectors for bent pins or damage, and plug it back in until you feel it click or seat fully. A loose cable is one of the most common causes of a black screen.
If you have a laptop, you cannot check an external monitor port the same way, but you can connect an external monitor using HDMI or USB-C. If the external monitor works, your laptop screen is likely broken and needs repair. If the external monitor is also black, the problem is in the computer itself, not the display.
Force a restart and watch for error messages
Hold down the power button on your computer for ten seconds until it shuts down completely. Wait a few seconds, then press the power button once to turn it back on. Watch and listen as it boots: you should see a logo (Dell, HP, Lenovo, or your motherboard maker), hear the fan spin up, and see lights on the case. If you see or hear nothing, the computer may not be getting power — check that the power cable is plugged in and the outlet works.
If the computer boots but the screen stays black, listen for beeping sounds. A pattern of beeps (such as one long beep followed by two short ones) is a diagnostic code that tells you what is wrong. Write down the pattern and search for it along with your computer brand — for example, "Dell one long beep two short beeps" — to find what the code means. Different manufacturers use different codes, so the brand matters.
If the computer boots silently and the screen is black, Windows may be running but not displaying. Try pressing Ctrl+Alt+Delete. If you hear a response sound or the screen changes, Windows is running and you can proceed to the Safe Mode steps below. If nothing happens, the graphics driver or hardware is likely the problem.
Boot into Safe Mode to test the graphics driver
Safe Mode loads Windows with only the essential drivers, which helps you figure out whether a third-party driver or software is causing the black screen. Restart your computer and when ready begin pressing F8 repeatedly (on some newer computers, hold Shift and press F8 instead). You should see a menu with options including "Safe Mode" and "Safe Mode with Networking." Select Safe Mode using the arrow keys and press Enter.
If the screen displays normally in Safe Mode, the problem is a graphics driver or a program that loads at startup. To fix it, restart normally and uninstall your graphics driver: right-click the Start button, select Device Manager, expand Display adapters, right-click your graphics card (usually NVIDIA, AMD, or Intel), and select Uninstall device. Restart the computer. Windows will reinstall a basic driver and you should see the desktop.
Once you can see the desktop, read the latest driver from your graphics card maker's website (nvidia.com, amd.com, or intel.com). Install it and restart. If the black screen returns, roll back to the previous driver version or contact the manufacturer's support.
Update or roll back your graphics driver
Graphics driver problems are a common cause of black screens on computers that were working before. If you recently updated Windows, installed a new driver, or installed new software, the black screen often started right after. To fix it, you need to either update the driver to a newer version or go back to the version that was working.
If you can see the desktop (or boot into Safe Mode), open Device Manager by right-clicking the Start button. Expand Display adapters and right-click your graphics card. Select Update driver and choose "Search automatically for updated driver software." Windows will read and install the latest version from the manufacturer. Restart and test.
If updating does not work, right-click the graphics card again and select Properties. Go to the Driver tab and click Roll Back Driver. This goes back to the previous version. If Roll Back Driver is grayed out, the previous version is not available — in that case, uninstall the driver completely, restart, and let Windows reinstall the basic version.
Test with a different video cable or port
A damaged video cable or a failed port on the graphics card can cause a black screen even when everything else is working. If you have a spare HDMI, DisplayPort, or VGA cable, swap it in and test. If you have a graphics card with multiple ports (many have two or three), try plugging the monitor into a different port on the same card.
If your computer has both a dedicated graphics card and built-in graphics on the motherboard, try plugging the monitor into the motherboard port instead. This tells you whether the graphics card itself has failed. If the screen works when plugged into the motherboard, the dedicated card is the problem and may need to be replaced.
On a laptop, you cannot swap ports, but you can test with an external monitor as described earlier. If an external monitor works but the laptop screen does not, the laptop screen or its cable is damaged.
When to seek professional repair
If you have tried all the steps above and the screen is still black, the problem is likely a hardware failure: a dead graphics card, a failed motherboard, or a broken monitor. At this point, professional repair is usually the next step. Take your computer to a local repair shop or contact the manufacturer's support line with the model number and a description of what you have already tried.
Before you take it in, write down what you have done: restarted the computer, checked cables, booted into Safe Mode, updated drivers, and tested with a different cable or port. This information helps the technician narrow down the problem and may save you time and money.
If the computer is still under warranty, contact the manufacturer first — they may cover the repair or replacement at no cost. If it is out of warranty, get a repair estimate before agreeing to work, as replacing a graphics card or motherboard can cost between $100 and $400 depending on the part.
Frequently Asked Questions
Why is my computer running but the screen is black?
The monitor may be off or disconnected, the graphics driver may have crashed, or the graphics card may have failed. Start by checking that the monitor is powered on and the video cable is plugged in firmly at both ends. If those are fine, restart the computer and try booting into Safe Mode to test whether a driver is the problem.
Can a black screen mean a virus or malware?
Malware rarely causes a black screen directly, but it can corrupt system files or disable the display driver. If you suspect malware, boot into Safe Mode and run a full scan with Windows Defender or a third-party antivirus tool. If the screen works in Safe Mode but not in normal mode, a startup program or driver is more likely the cause than malware.
What does it mean if my computer beeps when I turn it on?
Beeping is a diagnostic code that tells you what is wrong. The pattern matters — for example, one long beep and two short beeps means something different than three short beeps. Search for your computer brand and the beep pattern to find what it means. Some patterns indicate memory problems, others indicate graphics card failure.
Should I try opening the computer case to reseat the graphics card?
Only if you are comfortable working inside a computer and have grounded yourself to avoid static damage. Reseating the graphics card (unplugging it and plugging it back in) can fix a loose connection. If you are not confident, take it to a repair shop instead — opening the case incorrectly can cause more damage.
Is a black screen always a sign the computer is broken?
No. Many black screens are caused by loose cables, sleep mode, or a driver that needs updating — all of which are fixable without replacing hardware. Always check the physical connections and try a restart before assuming the computer is broken.