Windows camera errors
Start with the exact code, then verify camera detection.
DeviceOK keeps code-specific pages tied to current Microsoft documentation and a live webcam check instead of treating every camera failure as the same problem.
0xA00F4244 · NoCamerasAreAttachedWindows is not detecting the camera. Microsoft classifies 0xA00F4244 as a camera-detection error, so detection, privacy switches, drivers and the physical connection should be checked before assuming the camera sensor itself has failed.
→0xA00F4243 · Camera in use by another appMicrosoft maps 0xA00F4243 (and related variants it documents) to another app or process using the camera. The camera may be healthy but unavailable to the app you are opening.
→0x80070005 · Camera access deniedMicrosoft identifies 0x80070005 as camera access being denied. This points first to permission or app-access controls, not automatically to failed camera hardware.
→0xA00F4292 · Camera access restricted by policyMicrosoft maps 0xA00F4292 to camera access being restricted by policy. On managed work or school PCs, an administrator policy can override the user's app settings.
→0x800705AA · Insufficient system resourcesMicrosoft describes 0x800705AA as insufficient system resources to run the camera. A freeze or failure can therefore be caused by resource pressure rather than the camera being physically defective.
→0xA00F4246 · Camera locked by security softwareMicrosoft maps 0xA00F4246 (and also documents 0x800706BE in this class) to the camera being locked by security software. That makes security controls a specific diagnostic branch rather than a reason to replace the camera.
→0x80070490 · Camera device detection errorMicrosoft classifies 0x80070490 as a device-detection error related to registry or hardware issues. Start with the official troubleshooter and driver reinstall path instead of making unsupported registry edits.
→0xA00F4294 · Video start failedMicrosoft lists 0xA00F4294 as a video-start failure. The useful question is whether the camera can start in another trusted app or browser session, which separates an app path from a wider camera/driver problem.
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