If when you say faint you mean you can barely make out an image then the problem is most likely the backlight inverter in the screen assembly has gone bad. If what you mean is that the brightness got turned all the way down then it's just a matter of adjusting the brightness of the screen by holding down the function key (Fn) and pressing the LCD screen brightness adjustment keys noted usually by a picture of a sun or something similar accompanied by an up or down arrow.
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