From the manual:http://h10032.www1.hp.com/ctg/Manual/c01114193.pdf
Hotkeys are combinations of the fn key (lower left of keyboard) and one of the function keys:
Mute and restore speaker sound. fn+home
Increase speaker sound. fn+pg up
Decrease speaker sound. fn+pg dn
To use a hotkey command on the computer keyboard, follow either of these steps:
Briefly press the fn key, and then briefly press the second key of the hotkey command.
- or -
Press and hold down the fn key, briefly press the second key of the hotkey command, and then
release both keys at the same time.
Muting speaker sound (fn+home)
Press fn+home to mute speaker sound. Press the hotkey again to restore speaker sound.
Increasing speaker sound (fn+pg up)
Press fn+pg up to increase speaker sound. Hold down the hotkey to increase speaker sound incrementally.
Decreasing speaker sound (fn+pg dn)
Press fn+pg dn to decrease speaker sound. Hold down the hotkey to decrease speaker sound incrementally.
More manuals for this model:http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lc=en&product=3678775