Test your camera in the operating system first, before opening any app

The fastest way to know whether your camera works is to test it in your operating system's built-in camera tool, not in Zoom or Teams or whatever app you plan to use. If the camera works there, the problem is almost always the app's settings, not the hardware. If it fails there, you know the hardware or driver needs attention.

On Windows 10 or 11, open the Camera app from your Start menu. On macOS, open Photo Booth (search for it in Spotlight). On Linux, open Cheese or Guvcview, depending on your distribution. You should see your own face or the room in front of the camera within a few seconds. If you see a black screen or an error message, move to the hardware troubleshooting section below.

Take a screenshot or a test photo to confirm the image is clear and in focus. Move your head side to side and watch the video update in real time. This tells you the camera is capturing and sending data to your computer.

Key Takeaways

  • Test your camera in your operating system's built-in camera app before testing it in Zoom, Teams, or any other process.
  • If the built-in app shows video, the camera hardware works and the problem is in your app's settings or permissions.
  • If the built-in app shows a black screen or error, check that the camera is not physically blocked and that your operating system has the latest drivers installed.
  • Most camera problems come from app permissions being turned off, not from broken hardware.
  • Restart your computer after installing or updating camera drivers, then test again in the built-in app.

Check camera permissions in your operating system

Even if your camera works in the built-in app, other programs may not have permission to use it. Windows, macOS, and Linux all let you control which apps can access the camera, and many apps are blocked by default.

On Windows 10 or 11, go to Settings > Privacy & Security > Camera. You will see a list of apps. Make sure the toggle next to the app you want to use (Zoom, Teams, Discord, or whatever) is turned on. If the app is not listed, it may not have requested permission yet—open the app, try to start a video call, and Windows will prompt you to allow camera access.

On macOS, go to System Settings > Privacy & Security > Camera. You will see a list of apps that have asked for camera access. Check that your app is listed and that the checkbox next to it is marked. If your app is not listed, open it and try to use the camera; macOS will ask you to grant permission.

On Linux, permissions vary by distribution and desktop environment. GNOME-based systems use Settings > Privacy > Camera. KDE Plasma uses System Settings > Startup and Shutdown > Background Services. Check your distribution's documentation if you are unsure.

Test your camera in the app you plan to use

Once the built-in camera app shows video and you have granted permissions, test the camera inside the app itself. Most video conferencing and messaging apps have a camera preview or settings page where you can see what the camera is sending.

In Zoom, open Settings > Video and look for the camera preview window. In Microsoft Teams, go to Settings > Devices > Camera. In Google Meet, click your profile picture, then Settings, then Camera. In Discord, go to User Settings > Voice & Video. You should see your video feed in the preview. If you see a black screen or "No camera detected," go back and check permissions again.

If the app shows video but it looks dark, blurry, or upside down, check the app's camera settings for brightness, contrast, or rotation controls. Some apps let you flip the image or adjust exposure. If the image is still poor, the camera lens may be dirty—wipe it gently with a dry, soft cloth.

Restart your computer if the camera is not detected

If the built-in camera app shows "No camera detected" or a similar error, restart your computer. Many camera driver issues resolve after a restart, and it takes only a few minutes.

After the restart, open the built-in camera app again. If you still see an error, the camera driver may need to be updated or reinstalled. On Windows, right-click the Start button, select Device Manager, and look for Cameras. If you see a camera listed with a yellow warning triangle, right-click it and select Update driver. Windows will search for the latest driver online.

On macOS, camera drivers are built into the operating system and update automatically. If your Mac does not detect the camera after a restart, the hardware may be faulty. On Linux, use your package manager to reinstall the camera driver package for your hardware—this varies by distribution and camera model.

Check that the camera is not physically blocked or disabled

Before assuming the camera is broken, make sure nothing is covering the lens. Dust, a sticker, a webcam cover, or even a finger can block the image. Look at the camera directly and make sure the lens is clear.

Some laptops have a physical camera on/off switch or a keyboard shortcut to disable the camera. Check your laptop's manual or search for "[your laptop model] camera disable" to see if there is a hardware switch or key combination you may have pressed accidentally. On some models, Fn + a function key toggles the camera on and off.

If your camera is external (USB), make sure the cable is fully plugged in and the USB port is working. Try plugging the camera into a different USB port on your computer. If you have other USB devices plugged in, try unplugging them to see if a power issue is preventing the camera from working.

Uninstall and reinstall the camera driver on Windows

If updating the driver did not work, try removing it completely and letting Windows reinstall it from scratch. Open Device Manager again, right-click the camera, and select Uninstall device. Check the box that says "Attempt to remove the driver software for this device," then click Uninstall.

Restart your computer. Windows will automatically detect the camera and reinstall the driver. This process usually takes a few minutes. Once the restart is complete, open the built-in Camera app and test again.

If the camera still does not work after a clean reinstall, visit the camera or laptop manufacturer's website and read the latest driver directly. Uninstall the driver again, restart, then run the downloaded installer. Manufacturer drivers are sometimes more recent than what Windows finds automatically.

Test with a different app to narrow down the problem

If your camera works in the built-in app but not in Zoom or Teams, the problem is almost certainly that app's settings or permissions, not the camera itself. Try opening a different app—Discord, Google Meet, or even a video editing program—and see if the camera works there.

If the camera works in some apps but not others, check the permissions for the app that is not working. Go back to your operating system's privacy settings and make sure that specific app is allowed to use the camera. You may also need to restart the app after granting permission.

If the camera does not work in any app except the built-in one, the issue is likely a driver problem or a hardware conflict. Try the driver reinstall steps above, or contact the camera or laptop manufacturer for support.

Frequently Asked Questions

Why does my camera show video in the built-in app but not in Zoom?

Zoom does not have permission to use your camera. Go to your operating system's privacy settings (Settings > Privacy > Camera on Windows, or System Settings > Privacy & Security > Camera on macOS) and make sure Zoom is toggled on. Then restart Zoom and try again.

My camera is upside down or sideways. How do I fix it?

Most apps have a rotate or flip option in their camera settings. In Zoom, go to Settings > Video and look for a rotate button. In Teams, check Settings > Devices > Camera for rotation controls. If your app does not have this option, the camera may be mounted upside down—you can physically rotate it or use a third-party tool to flip the video feed.

The camera image is very dark. Is the camera broken?

Probably not. Check the app's brightness or exposure settings first—most apps let you adjust these. Make sure you are in a well-lit room and that nothing is blocking the light. If the image is still dark, try adjusting the camera's physical position to face a light source. If it is still dark in the built-in camera app, the camera sensor may be faulty.

I have an external USB camera that worked before but now shows "No camera detected." What should I do?

Unplug the camera, wait 10 seconds, and plug it back in. Try a different USB port. If it still does not work, uninstall the camera driver in Device Manager (Windows) or remove the camera from System Report (macOS), then restart your computer. The driver will reinstall automatically when you plug the camera back in.

Can I test my camera without opening Zoom or Teams?

Yes. Use your operating system's built-in camera app—Camera on Windows, Photo Booth on macOS, or Cheese on Linux. These apps do not require any setup and will tell you when ready whether the camera hardware is working.