Camera with black screen

1. Physical check 
Wipe the camera lens clean (laptop users check the physical switch) 
Try to test with other apps (e.g. Camera App/WeChat, etc.) 
2. Quick reboot 
Completely shut down (press and hold the power button for 10 seconds) → Reboot 
3. Check camera permissions 
Settings → Privacy & Security → Camera 
Ensure that: 
"Camera Access" is turned on 
App permissions underneath are permitted 
4. Disable energy-saving settings 
Device Manager → Camera Right click on Camera → Properties → Power Management 
Cancel "Allow computer to turn off this device" 
5. Update Driver 
Device Manager → Camera 
Right click on Camera → Update Driver → Auto Search 
 Rollback Driver (if there is a problem with the update) 
Open Driver Properties as above 
Select "Rollback Driver" 
6. System Repair 
 Run Hardware Troubleshooting 
Settings → System → Troubleshooting 
Run Hardware and Devices Troubleshooting 
7. Reinstall the Camera app 
PowerShell: 
powershell 
Get-AppxPackage *Microsoft.WindowsCamera* | Remove-AppxPackage 
and then reinstall it from the App Store 
8. System Restore 
Settings → System → Restore 
Select "Go back" to the previous normal point in time.