Undetected built-in cameras on the Razer Blade are mostly caused by software issues or hardware issues. Follow these steps to resolve this issue.
You can view the video below for instructions or review a copy of the video transcript.
Step-by-step process:
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Ensure Windows is up to date. See How to get the latest software and driver updates from Windows.
If you just updated Windows, please install the "Optional updates" under Settings > Windows Update > Advanced options.
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After the update, restart your Razer Blade and check if your camera has been detected.
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If the issue persists, verify that your apps have permission to use your camera.
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Go to "Settings" > "Privacy" > "Camera".
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Under "Allow Access to the camera on this device", ensure that the "Camera access for this device is on".

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Scroll down and confirm that your Microsoft Store app has access to the camera.

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For other apps, ensure that the "Allow desktop apps to access your camera" is turned on.

If your camera is still not detected, reinstall your driver.
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Go to "Device Manager".
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Locate and right-click on your camera, then select "Uninstall".

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Follow the on-screen instructions and complete the uninstallation process.

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After the uninstallation is complete, go back to "Device Manager".
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Select "Action" > "Scan for hardware changes".
This process takes a few moments to detect and install the driver for your camera.