What the independent test changes
If DeviceOK passes
A working DeviceOK preview is strong evidence that the camera can provide video; prioritize Zoom selection/permission/app conflicts.
If DeviceOK fails
No DeviceOK preview points back toward camera detection, privacy shutter, browser/OS permission, USB connection or driver/hardware issues.
Check these in order
- 1
Run DeviceOK Webcam Test and confirm the intended camera can stream video.
- 2
Close other programs that may be using the camera.
- 3
In Zoom video settings, select the correct camera.
- 4
If the browser works but Zoom does not, verify Zoom camera permission in the operating system.
Retest instead of guessing
After changing one setting, run the independent DeviceOK test again before moving to a more invasive step. This preserves evidence and avoids changing multiple variables at once.
Retest Webcam test