To disable onboard sound, you can follow these general steps:
Open the Device Manager: On Windows, you can right-click on the Start button and select "Device Manager" from the menu. On macOS, go to "Applications," then "Utilities," and open "Audio MIDI Setup."
Locate the Sound Device: In the Device Manager or Audio MIDI Setup, look for the category related to sound devices or audio controllers. It is usually labeled as "Sound, video and game controllers" or "Audio Devices."
Disable the Onboard Sound Device: Expand the sound devices category and find the specific onboard sound device. Right-click on it and select "Disable" or "Disable Device." On macOS, select the device and click on the "-" button at the bottom to disable it.
Confirm the Action: You may receive a confirmation prompt asking if you want to disable the device. Click "Yes" or "OK" to proceed.
Restart the Computer: It's recommended to restart your computer to ensure the changes take effect.
After following these steps, the onboard sound device should be disabled, and your computer should no longer use it for audio output or input. If you ever want to re-enable the onboard sound, you can revisit the Device Manager or Audio MIDI Setup and choose the "Enable" option for the respective device.
Please note that the steps above are general guidelines, and the exact process may vary slightly depending on your operating system version or the specific configuration of your computer.