Acer Aspire One D270 Series Service Manual page 132

Speakers are selected as the default audio device (green check mark).
NOTE:
If Speakers does not show, right-click on the Playback tab and select Show
Disabled Devices (clear by default).
7. Select Speakers and click
prompts to configure the speakers.
8. Remove any recently installed hardware or software.
9. Restore system and file settings from a known good date using System Restore.
10. If the issue is remains, repeat step 9, selecting an earlier time and date.
11. Reinstall the operating system.
12. If the issue is still not resolved, refer to
4-12
http://mycomp.su - Maintenance and Service Guide,Service Manual,Motherboard Schematics for Laptop/notebook
Ремонт ноутбуков.Запчасти и комплектующие для ноутбука. Схемы,сервис мануалы,инструкции по разборке ноутбука.
NOTE:
Configure
to start Speaker Setup. Follow the on-screen
Online Support Information
.
Troubleshooting