Your Notebook might be missing Sound driver.
Here is the download link : http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles/1ga241ww.exe
Download the driver and install it.Your sound should work fine.
For sound icon.
Go to "Control Panel"
Click "Sound and Audio devices"
Under "Device Volume" tick " Place the Volume icon in the Taskbar."
Your Sound Mixer will automatically comes when you double click the Sound icon.
That's it.
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