The most common reason is a loose or damaged cable, but the problem could also be in your graphics card, your monitor's input settings, or your PC's display drivers

When your monitor shows no picture, the issue is almost always one of four things: the cable connecting them is loose or broken, the monitor is set to the wrong input source, your PC's graphics drivers need updating, or the graphics card itself has failed. Most of the time you can fix this yourself in under five minutes by checking the cable first, then the monitor's input button, then restarting your PC. If none of that works, the problem is likely hardware that needs replacement.

The reason this happens so often is that monitor cables get bumped, bent, or accidentally unplugged — especially if your desk is crowded or you have pets. Even a cable that looks fine can have a broken wire inside. And because monitors have multiple input options (HDMI, DisplayPort, USB-C, VGA), it's straightforward to accidentally switch to the wrong one and forget you did.

Key Takeaways

  • Check that the cable connecting your monitor to your PC is fully plugged in on both ends, and look for visible damage like bent pins or crushed plastic.
  • Press the input or source button on your monitor (usually on the bottom or side) and make sure it's set to the same connection type you're using — HDMI, DisplayPort, or whatever cable you plugged in.
  • Restart your PC completely, because sometimes the graphics driver loses connection and a restart fixes it without any other action.
  • If you have a second monitor or TV, try connecting it to the same cable to tell whether the problem is the monitor, the cable, or the PC itself.
  • If the monitor still shows nothing after these steps, the graphics card inside your PC may have failed and will need professional repair or replacement.

Check the cable first — it's the fastest fix

Unplug the cable from both the back of your PC and the back of your monitor, then plug it back in firmly. You should hear or feel a small click when it seats properly. Do this even if the cable looks plugged in — a cable that's halfway in will show no picture.

While the cable is unplugged, look at both ends for damage. If the metal pins inside the connector are bent, crushed, or missing, or if the plastic around the connector is cracked or melted, the cable is broken and needs to be replaced. A damaged cable will not work no matter how firmly you push it in. If the cable looks fine, plug it back in and move to the next step.

Make sure your monitor is set to the right input

Monitors have an input button, usually labeled "Input," "Source," or "Menu," located on the bottom edge or the side of the monitor frame. Press it and look at the menu that appears on screen. You should see a list of options like "HDMI 1," "HDMI 2," "DisplayPort," or "VGA." The option that is currently selected (usually highlighted or with a checkmark) is the input your monitor is listening to.

Find the input that matches the cable you plugged in. If you used an HDMI cable, select "HDMI 1" or "HDMI 2." If you used a DisplayPort cable, select "DisplayPort." If you're not sure which cable you used, look at the connector on the cable itself — HDMI is flat and rectangular, DisplayPort is rectangular with a small notch, and VGA is three rows of small holes. Select the matching input and your monitor should light up with your PC's screen.

Restart your PC completely

If the cable is plugged in and the monitor is set to the right input but you still see nothing, restart your PC. Hold down the power button on the front of your PC for about 10 seconds until it shuts off completely, then wait 30 seconds and press the power button again to turn it back on. This forces your PC to reload the graphics driver — the software that tells your graphics card how to send a picture to your monitor.

While your PC is restarting, you should see text or a logo appear on your monitor. If you see the Windows logo or your PC's startup screen, the monitor is working and the problem is solved. If the screen stays black, move to the next step.

Test with a different monitor or cable to narrow down the problem

If you have a second monitor, TV, or laptop, try connecting it to the same cable you've been using. If the second device shows a picture, the problem is your PC's graphics card or graphics driver. If the second device also shows nothing, the cable is broken and needs to be replaced.

If you have a second cable (even if it's a different type, like VGA instead of HDMI), try using that cable to connect your original monitor to your PC. If the second cable works, your original cable is broken. If the second cable also shows nothing, the problem is likely your PC's graphics card.

Update your graphics drivers if you see a picture but it's distorted or flickering

If your monitor is showing a picture but the image is fuzzy, has strange colors, flickers, or shows only part of the screen, the problem is usually outdated or corrupted graphics drivers. On Windows, right-click on your desktop and look for an option that says "NVIDIA Control Panel," "AMD Radeon Settings," or "Intel Graphics Settings." If you see one of these, click it and look for an option to update drivers or check for updates.

If you don't see any of these options, open Windows Update by pressing the Windows key and typing "update." Click "Check for updates" and let Windows read and install any available driver updates. Restart your PC when prompted. If the picture is still distorted after the restart, the graphics card may be failing.

When the problem is your graphics card

If you've checked the cable, tried a different monitor or cable, restarted your PC, and updated your drivers, but your monitor still shows nothing, your graphics card has likely failed. A graphics card is a piece of hardware inside your PC that generates the picture your monitor displays. When it fails, no amount of software troubleshooting will fix it.

You have two options: take your PC to a repair shop to have the graphics card replaced, or if your PC is very old, it may be more cost-effective to replace the entire PC. A repair shop can diagnose the problem and give you a price quote before they do any work. If your PC is still under warranty, contact the manufacturer to see if the repair is covered.

Frequently Asked Questions

Why does my monitor work sometimes but not always?

A loose cable is the most common cause. If your monitor works after you jiggle the cable or restart your PC, the cable connection is probably not fully seated. Unplug it, inspect both ends for damage, and plug it back in firmly. If it keeps happening, replace the cable — it's cheaper than a new monitor.

My monitor shows "No Signal" — is that different from a black screen?

No, they mean the same thing. "No Signal" is a message your monitor displays when it's powered on and set to the correct input, but it's not receiving any picture data from your PC. Follow the same troubleshooting steps: check the cable, verify the input setting, and restart your PC.

Can I use any cable to connect my monitor to my PC?

No. Your monitor and PC must both have the same type of connection. If your monitor has only HDMI ports, you need an HDMI cable. If your PC has only DisplayPort, you need a DisplayPort cable. Some adapters exist (like HDMI to DisplayPort), but they don't always work reliably. Buy a cable that matches both devices.

What if my PC turns on but my monitor stays black?

Your PC is running but not sending a picture to your monitor. Check the cable and input setting first. If those are correct, restart your PC. If the screen stays black after restart, try a different cable or monitor to tell whether the problem is your PC's graphics card or the monitor itself.

Is it safe to open my PC to check the graphics card?

Only if you know what you're doing. Opening your PC can damage components if you touch the wrong things or create static electricity. If you think your graphics card has failed, take your PC to a repair shop instead of opening it yourself.