Acer AO725 Service Manual page 179

Start Control Panel Hardware and Sound Sound
6. Navigate to
Speakers are selected as the default audio device (green check mark).
NOTE: 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
Troubleshooting
Configure
to start Speaker Setup. Follow the on-screen
Online Support Information
. Confirm that
.
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