It's probably gone bad, I've seen a much higher rate of failure on the backlights after 3 years...so much so that I spec'd out my current LCD desktop displays in the office for replacement after 3 years. There are people who sell replacement lights (i think they are fluorescent) and instructions on how to replace them...i've never tried it.
You might want to watch ebay for a "parts" sale of your current laptop. Sometimes you can get one on the cheap and replace the entire lcd yourself.
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