Acer Aspire 5750 Service Guide - Page 145

5. Make sure that all volume controls are set mid range: Click the volume icon on the taskbar Drag the slider to 50. Confirm that the volume is not muted. Click Mixer to verify that other audio applications are set to 50 and not muted. 6. Navigate to Start Control Panel Hardware and Sound Sound. Confirm that 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 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 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 Online Support Information. http://Tmroyucbloesmhopo.tsinug 4м-1а1