Left speaker not working

[stanleyluilai]

First, reboot your computer. Ensure that the computer isn't muted via hardware. Press any external mute buttons, confirm that the speakers are turned on, and turn the volume all the way up.

 

[stanleyluilai]

for testing just run linux from usb, no need install...

Test by playing a song or using the Sound control panel (click the Sounds tab, select Asterisk, and click Test). good luck bro!