If there is a situation that the manual Brightness / contrast control of your monitor or laptop screen malfunctioning and you have left with no choice other than to see it a Computer Hardware Engineer, then it would be best to test out this small application called Desktop Lighter .
Desktop Lighter lets you adjust the brightness of your screen easily and quickly at your hand control. It can change the brightness level by a track-bar slider or by keyboard command hotkeys. To set the brightness you can use both the Desktop Lighter track-bar and keyboard hotkeys (Ctrl+<) & (Ctrl+>) when the program sits in system tray.
This programs also works best for Dell Studio One Laptop where there is no Brightness / Contrast tool on LED control panel. This program is free to use and does not require much memory to function.
Download Desktop Lighter