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Look at your keyboard some of the keys have blue symbols on them, that's the second function. At the bottom left of your keyboard next to the control key there's a button that says Fn on it hold that down and then press one of the other buttons to use the second function. The brightness control is the up and down arrows. Hold Fn and press up or down to change the brightness. Also if your laptop is set to a lower power setting the display wont be as bright. Click on the little battery symbol at the bottom right hand corner of the screen a little menu will pop up that says select a power plan if its set to power saver your screen wont be as bright.
Press the Fn key and the up arrow key simultaneiously, this should increase the brightness. (down arrow key reduces the brightness)
If this does not increase or decrease the brightness, then the problem should be with the backlight or the backlight circuits. Please contact Dell for a replacement of the LCD panel (if your computer is in warranty) if not contact a local tech who can replace the LCD panel or the Backlight for your laptop
Try increasing the brightness of the system. Laptops have "Fn" combination buttons that allow you to use some shortcuts. Look for a button on the keyboard that usually looks like a sun or bright object with an arrow pointing up. Press and hold the "Fn" button down and press the designated button to increase brightness.
To adjust the brightness of LCD screen, hold down the FN key, repeatedly press the arrow keys to increase brightness. Or, hold down the FN key, repeatedly press the arrow keys to reduce the brightness.