Windows 10 plays startup sound when your computer starts up. Follow below steps if you want to disable windows startup sound.
- Right Click or Tap on Volume icon in notification area on bottom right side of your screen, and select 'Sounds' from pop-up menu. This will open Sound Settings dialog with 'Sound' Tab as active.
- In Sound Settings dialog, Uncheck 'Play Windows Startup Sound' checkbox.
- Click on 'Apply' button and then click on 'OK' button to close Sound Settings dialog. This will disable Windows startup sound from next computer startup.