Acer ASPIRE E1-521 Service Manual page 91

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Navigate to Start > Control > Panel > Hardware and Sound > Sound. Confirm that Speakers
6.
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).
Select Speakers and click Configure to start Speaker Setup. Follow the on-screen prompts
7.
to configure the speakers.
Remove any recently installed hardware or software.
8.
Restore system and file settings from a known good date using System Restore.
9.
If the issue is remains, repeat step 9, selecting an earlier time and date.
10.
Reinstall the Operating System.
11.
If the issue is still not resolved, refer to
12.
Troubleshooting
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