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Usually along the top row of keys on your keyboard (either the number keys or Function keys), there will be two keys that have additional markings on them to somewhat signify that they also control the keyboard backlighting.
Fiddling with those might help adjust the brightness. If you are aware of the model number of your Lenovo, you can look up the corresponding drivers and manual that pair with Windows 8 on their support website, located here:
NUMBER LOCK You have press the NumLk key (number lock) and this changes the right hand keys to a number pad. Press the NumLk key (also doubles as the ScrLk key to toggle the Number lock). it is near the F12 function key. When the NumLk has been enabled a LED light is turn on to indicate this function has been selected. Press the NumLk key again to turn off the Number Lock.
Try this, it may help. There should be a Blue lettered function button on the lower left hand side of the keyboard (hard to see unless you are in a well lit room) . Along the top row of keys, F1 through F12 there will be an equally hard to see blue graphic symbol depicting a laptop monitor and something that is supposed to represent a separate desktop monitor. WHILE THE MACHINE IS UP AND RUNNING HOLD DOWN THE FUNCTION KEY AND PUSH THAT "MONITOR" KEY. THE SCREEN MAY POSSIBLY COME ALIVE. This one has stumped the experts before. Worth a try. Hope this helps, Best, Mark
On a notebook computer, there is a FN key that when pressed with the appropriate special function key will disable the normal keyboard and enable the alternate letters (printed in a different color) on your keyboard. Unfortunately, I can't remember which special function key that is--but the icon on it should give you a clue.
You can probably brighten the display easily by pressing the function key (fn) to the left of your space bar, and pressing one of the numbered function keys at top of key board. It would probably have something like a picture of a sun on it.
Laptop will often have a function key (usually F5) for cycling between built-in display, external monitor, and both. Try pressing F5. If that doesn't work and you have a "Fn" key (usually near the left Shift key) hold down Fn and press F5.
The Fn button is like a 'shift' key. Just as you would press <Shift> and a letter to get a capitalized letter, you press <Fn> and a function key at the same time ( <Fn><F1> or <Fn><F2> and so on) to use the secondary function for that key. For example, on one of my laptops, the <F2> key has an icon for 'wireless' (looks like an antenna). If I simply press <F2>, I will activate the function for <F2>, but if I press <Fn> and <F2> at the same time, I will turn on my wiress adapter.