Acer Aspire 7750Z Acer Aspire 7750, 7750G, 7750Z Notebook Service Guide - Page 133
Disabled, Devices, Reinstall the Operating System.
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6. Navigate to Start Control Panel Sound. Confirm that Speakers are selected as the default audio device (green check mark). NOTE: NOTE: If Speakers do not show, right-click on the Playback tab and select Show Disabled Devices (clear by default). 7. Select Speakers and click Configure to start Speaker Setup. Follow the on-screen 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 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 Online Support Information. Troubleshooting 4-11