HI,
It sounds like either your backlight or inverter. These are very low in cost, and can be replaced very simply. Go to Dell's support center and connect with their manual showing you the part number that you need to purchase, and shop elsewhere for it. eBay is always a good place for replacement parts. Once you get it, then follow the manual from Dell and start unscrewing! Once you get to the the inverter or backlight you just pull out the old and place in the new one. You'll know immediately if it works or not. The cost is around $20.00 vs. the cost of a new laptop.
Good Luck
Mark
One simple solution could be... Hold the function key and press F8 to brighten, F7 will darken. It's just a possibility.
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