Using the Keyboard 15
When you press a function key combination, the system
sound may be temporarily muted.
If you reinstall Windows, install the internet launcher for
volume control function keys on keyboard, <Fn + F8/F9/F10>.
Or use the windows volume control on your screen.
<Fn+Right
Arrow>
Brightness up: Increases the LCD brightness.
<Fn+Left
Arrow>
Brightness down: Decreases the LCD brightness.