Article: Not all HP Pavilion laptops have backlit keyboards. If you've been unable to find the option to turn on the backlight thus far, check your computer's manual or online documentation to determine whether or not your keyboard has a backlight. In some cases, your computer's keyboard backlight may not turn on if your computer isn't charged past a certain point while off the charger. You can solve this problem by plugging your computer into its charger. The "Backlight" key is always one of the function keys (typically F5) at the top of your keyboard. It has a symbol resembling three dots on it. If your computer's keyboard is set to use the function keys' hardware features when pressed, this will cycle through your keyboard's brightness settings. You should see the keyboard's backlight dim and brighten accordingly. If nothing happens when you press the "Backlight" key, proceed to the next step. You'll find the Fn key in the lower-left side of the keyboard. If you couldn't turn on the backlight in the last step, holding the Fn key while pressing the "Backlight" button will cause your computer to use the key to change the backlight's brightness. You may have to press the "Backlight" key a few times while holding down Fn to cycle through all of the brightness options.
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Make sure that your HP Pavilion has a keyboard backlight. Plug your computer into its charger. Find the "Backlight" key. Press the "Backlight" key a few times. Try using the "Backlight" key while holding Fn.