Is it the device, the browser or the app?

Start with the simplest reproducible action: one key, one button, a short sentence or one camera preview. Note what happens without changing several settings at once. A browser test narrows the question to whether a signal reaches this page.

If the test works here but not in your meeting or game, inspect that application’s selected device, permissions and mute settings. A working browser preview does not guarantee that another app is using the same camera or microphone.

If the same problem appears everywhere, reconnect the device, try another suitable port and compare with a known-working device. Intermittent faults need repeated checks. Avoid attributing every failure to hardware: drivers, remapping software and accessibility settings also affect input.