Prove the hardware path
Microphone Level TestSee a live input level meter and identify audio that is too quiet or clipping.
→Webcam TestOpen your webcam locally to verify that the browser can access and display a live camera stream.
→Screen Share TestVerify that your browser can open the screen/window/tab sharing picker and start a local capture stream.
→Left Right Speaker TestPlay left and right channel tones separately.
→Go to the closest symptom
Device-specific OBS Studio troubleshooting
OBS Microphone Has No InputProve the microphone signal before changing OBS sources, mixer routing or audio monitoring.
→OBS Webcam or Capture Source BlackCheck whether the webcam/capture prerequisite works independently before changing OBS Video Capture Device properties.
→OBS Display or Screen Capture Not WorkingVerify that the browser/OS can present a screen-capture chooser, then focus on OBS display/window source and OS capture permissions.
→OBS Virtual Camera Not WorkingUse OBS's official virtual-camera troubleshooting after confirming the physical webcam or source works independently.
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