If Windows sound also fails without an HDMI or DisplayPort monitor: No sound in Windows: settings and initial checks
Check whether the monitor actually has speakers
A monitor listed as a Windows audio device does not establish that it contains speakers. Check the specification for its exact model. Some displays require external speakers or headphones to reproduce audio. Replacing an HDMI cable will not add speakers to a display without them. Also distinguish an audio input from a headphone or audio output when checking the available sockets.
Choose the intended audio destination
Open Windows Settings → System → Sound and inspect the selected output device. Choose the laptop speakers if that is where you want sound, or the relevant display for monitor audio. Check both system and application volume. Use a familiar audio recording as a comparison; conferencing software may have its own device selection and should not be your only test.
Review the monitor controls and connection chain
Check volume and mute in the monitor menu if the model provides those settings. Write down the complete connection: computer, dock or adapter, cable and display. Where possible, compare a direct HDMI or DisplayPort connection. Change one item at a time and record which port you used so that a successful test identifies something meaningful about the original setup.
If the output device is missing altogether
Confirm that the monitor is on, reconnect the external cable and restart the computer. If the output remains absent, record the equipment models and Windows messages. Choose drivers using the manufacturer’s documentation. Installing several unrelated audio packages makes comparison harder; keep a note of the original configuration and changes instead of repeatedly replacing software without a clear test.
When to arrange further diagnosis
Further checks make sense if a known-working cable and correct output selection do not resolve the issue. Do not keep wiggling a socket that only works under pressure. Tell the technician whether headphones work, whether the monitor produces sound with another computer, and when audio disappears. Those comparisons help distinguish a configuration enquiry from a connection or hardware examination.
Sources and further reading
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