HP Pavilion ZE4000 Startup Manual page 17

The keyboard status lights, located above the keyboard, indicate the states of the
keyboard locks.
1 Caps Lock On. Caps Lock is active.
2 Num Lock On. Num Lock is active. (The Keypad Lock must also be on to use
the embedded keypad.)
3 Keypad Lock On. The embedded keypad is active (Fn+F8). Num Lock must
also be for the numeric keys. Otherwise, cursor control is active (as marked on an
external keyboard).
Getting Started with Your Notebook
Identifying Parts of the Notebook
Startup Guide 9