MY camera is not working

Perform a full power reset to release the camera from the application or service reserving it, which is the accepted resolution for the exact 0xA00F4243<CameraReservedByAnotherApp> (0xC00D3704) error shown.^1^

Release the camera

1. Save your work and completely shut down the PC.
2. Disconnect the charger and any USB camera.
3. If the laptop has a removable battery, remove it.
4. Hold the physical power button for 15–30 seconds.
   • With a non-removable battery, hold it for about 15–20 seconds.
5. Reconnect the battery and charger, start Windows, and test the Camera app before opening Teams, Zoom, a browser, or other camera software.

If that does not resolve it, press Ctrl+Shift+Esc, open Task Manager, and close camera-capable applications such as Teams, Zoom, browsers, and webcam utilities. Then test Camera again.

Check camera permissions

Go to Start → Settings → Privacy & security → Camera, then turn on:

• Camera access
• Let apps access your camera
• Access for the Camera app
• Let desktop apps access your camera

The last setting is required for desktop programs such as browsers and Teams. If Camera access cannot be changed, an administrator must change it.^2^

Repair the Camera app

If only the Camera app fails while the camera works in another application:

1. Open Settings → Apps → Installed apps.
2. Find Camera, select the three-dot menu → Advanced options.
3. Select Repair and test it.
4. If it still fails, select Reset and test again.^3^

Resetting clears the Camera app’s local settings but does not remove personal photos.

If Windows does not detect the camera

If Device Manager has no working camera or the Camera app changes to 0xA00F4244 NoCamerasAreAttached:

1. Right-click Start → Device Manager.
2. Expand Cameras and open the camera’s Properties.
3. Select Driver → Update driver → Browse my computer for drivers → Let me pick from a list.
4. Select USB Video Device, choose Next, and restart Windows.

If that driver is unavailable or does not work, obtain the camera driver from the PC manufacturer using the model shown under Device Manager → Camera → Properties → General.[^4^](https://support.microsoft.com/windows/hardware/camera/camera-app-shows-error-0xa00f4244-nocamerasareattached "Camera app shows error "0xA00F4244 NoCamerasAreAttached" | Microsoft Support")

If the error remains, reply with the PC manufacturer/model and whether the camera appears under Device Manager → Cameras.

References

1. How to fix error code 0xA00F4243<CameraReservedByAnotherApp>(0xC00D3704) - Microsoft Q&A
2. [Windows 11](https://support.microsoft.com/windows/privacy/manage-app-permissions-for-a-camera-in-windows#exceptions-to-camera-privacy-settings)
3. [Windows 11](https://support.microsoft.com/windows/apps/repair-apps-and-programs-in-windows#summary)
4. Camera app shows error "0xA00F4244 NoCamerasAreAttached" | Microsoft Support