How to fix my camera

BERNARDO CALISTO 20 Reputation points
2026-03-11T00:23:58.8033333+00:00

My camera is not working after several times of uninstalling and reinstalling, it always shows the same ERROR: 0xA00F4240<Unknown> (0x80004003)

Windows for home | Other | Performance and system failures

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  1. Divya Gupta 0 Reputation points
    2026-06-10T12:54:26.9966667+00:00

    same happening for me User's image

    Any solution ?

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  2. Vikki-T 8,550 Reputation points Microsoft External Staff Moderator
    2026-03-11T10:57:09.7233333+00:00

    Dear BERNARDO CALISTO,

    I understand how disruptive it is when the Camera app keeps showing 0xA00F4240 <Unknown> (0x80004003) even after multiple reinstall attempts. At this point, I recommend that you review and try the steps provided in the AI-generated answer on your thread. In addition, please reply with the information requested by the Independent Advisor, as that information can help continue the troubleshooting more efficiently and reduce repeated questions. To help narrow this down further, could you please share a few details: 

    • Device make/model and whether you’re using the built‑in camera or a USB webcam. 
    • Your Windows version/build (Settings > System > About). 
    • Could you let me know exactly where the error appears and at what moment? 
    • In Device Manager, does the camera appear under Cameras/Imaging devices (with or without a warning icon)? 
    • Do you use any OEM privacy utilities or antivirus webcam protections? 
    • Did the issue begin after a recent Windows update, driver install, or app change? 

    In the meantime, here are additional steps that you can try: 

    1. Make sure no physical privacy control is blocking the camera 
    • Many laptops have a privacy shutter/switch or a keyboard key (e.g., HP shutter key/switch; Lenovo privacy mode/F8).
    • Open the shutter or enable the camera with the hotkey, then test again.  
    1. Confirm Windows privacy permissions (include desktop apps) 
    • Go to Settings > Privacy & security > Camera. Turn Camera access On and Let apps access your camera On. 
    • Scroll down and also turn on Let desktop apps access your camera (needed for Teams, browsers). 
    1. Close other apps that might be “holding” the webcam 
    • Only one app can sometimes lock the camera. Close all video/meeting apps (Teams/browsers) or use Task Manager > Processes > End task, then open just one app and test.  
    1. Ensure the camera isn’t disabled in Windows 11 “Cameras” settings 
    • Open Settings > Bluetooth & devices > Cameras. If your camera appears under Disabled cameras, select it and click Enable, then test again. 
    1. Repair/Reset the built‑in Camera app state 
    • Go to Settings > Apps > Installed apps > Camera > Advanced options > Repair.
    • If no change, click Reset and test again.
    1. Check any OEM privacy utilities 
    • Some vendors ship a separate privacy control that overrides Windows permissions (e.g., Lenovo Vantage > Device > My Device Settings > Camera Privacy Mode). Ensure the OEM privacy toggle is Off and try again. 

    While my initial response may not fully resolve the issue, I truly appreciate your cooperation as we work together toward identifying the most effective solution. Thank you so much for your understanding. 

    I hope these steps help restore your camera promptly and minimize any disruption to your daily work. Wishing you a smooth, reliable experience on your Windows device moving forward. 

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".  

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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  3. AI answer

    2026-03-11T00:24:15.71+00:00

    Error 0xA00F4240 with inner code 0x80004003 indicates a device detection or driver/registry issue. Use the following steps in order.

    1. Test the camera in the Camera app
    • Select Start > Camera.
    • If the preview works here but not in another app, adjust that app’s camera settings instead.
    1. Run the Camera troubleshooter
    • On Windows 10 or 11, open the Get Help app and run the Camera troubleshooter: Run the troubleshooter in Get Help.
    • Alternatively (Windows 11):
      1. Select Start > Settings > System.
      2. Select Troubleshoot > Other troubleshooters.
      3. Find Camera and select Run.
    1. Check Windows Update (including optional driver updates)
    • Select Start > Settings > Update & Security (Windows 10) or Windows Update (Windows 11).
    • Select Check for updates.
    • If available, select Advanced options > Optional updates and install any camera or imaging device driver updates.
    • Restart the PC: Start > Power > Restart.
    • Test again with the Camera app.
    1. Verify the camera is detected in Device Manager
    • Select Start, type device manager, and open it.
    • Look under Cameras, Imaging devices, or Sound, video and game controllers.
    • If the camera is missing:
      1. In Device Manager, select the Action menu.
      2. Select Scan for hardware changes.
      3. Wait for detection to complete, then restart and test the Camera app.
    1. Roll back the camera driver (if the issue started after an update)
    • In Device Manager, right-click the camera > Properties.
    • Go to the Driver tab and select Roll Back Driver (if available), then Yes.
    • Restart the PC and test the Camera app.
    1. Cleanly reinstall the camera driver
    • In Device Manager, right-click the camera > Properties.
    • On the Driver tab, select Uninstall Device.
    • Check Attempt to remove the driver for this device (or Delete the driver software for this device), then select OK.
    • In Device Manager, open the Action menu and select Scan for hardware changes.
    • Wait for Windows to reinstall the driver, restart the PC, then test the Camera app.
    1. Switch to the in-box UVC driver (USB webcams)
    • In Device Manager, locate the USB webcam under Cameras or Imaging devices.
    • Right-click the webcam > Update driver.
    • Select Browse my computer for drivers.
    • Select Let me pick from a list of available drivers on my computer.
    • Choose USB Video Device and select Next.
    • Close the wizard, then restart and test.
      • Note: The in-box UVC driver may not support all camera features (for example, Windows Hello face recognition).
    1. Check antivirus or firewall blocking
    • Open the installed antivirus or firewall application.
    • Temporarily disable or pause protection from its Settings/Tools/Protection area.
    • Test the Camera app.
    • Re-enable protection immediately after testing.

    If the camera still does not work after these steps, check the camera manufacturer’s support site for a specific driver or firmware update, and test the camera on another device to rule out hardware failure.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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  4. Estrella721 45,245 Reputation points Independent Advisor
    2026-03-11T00:58:15.1566667+00:00

    Let's check some additional information to help resolve the issue:

    1. What is the make and model of your device?

    In the search bar, type MSINFO32 and hit Enter.

    Please share a screenshot of that window.

    1. Press Windows + X and choose Device Manager.

    Click View > Show Hidden devices

    Expand Camera Section.

    Take a screenshot and share it here.

    1. Are you using Windows 10 or 11?

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