To Turn On Backlit Keyboard in Dell laptops like Studio/Vostro/XPS/Latitude, “Hold the Fn key and press the Right Arrow key”. You can see all symbols illuminating on the keys. With the same hotkey, you can toggle between the three lighting states (in the given order). The lighting modes are full keyboard, half keyboard and off.How do I Reset my Dell laptop keyboard?
How to Restore the Dell Keyboard. Click the "Start" or Windows button in the lower-left corner of your screen, then select "Control Panel.". Double-click the "System" icon, then click the "Device Manager" button. Click the "+" sign or the arrow symbol next to "Keyboards," then right-click on your keyboard and select the "Uninstall" option.