From what I can find, it looks like your screen is one of the older CCFL backlight types. This kind of screen uses an inverter to power the backlight bulb. It sounds like there is a short, or something making an electrical connection where it shouldn't.
Your probably not under warranty anymore, so if your not afraid of a little DIY, replacing the inverter (or maybe just eliminating the short with some electrical tape) would be an inexpensive fix. A local repair shop could make quick work of it - and could possibly have an inverter in stock. eBay is a good source for finding a replacement (usually $10-$25). What ever you do, don't take it to Best Buy - they'll just over quote it and tell you to buy a new one.
I even found a how to for your model:
http/www.youtube.com/watch?v=N3LMifHb_eo
The inverter will be a small circuit board that is located directly below the screen with different wires coming from each end. One end will be power from the Motherboard (it splits off from the video cable) The video cable could be pinched as well. You may see some burnt blackness as a result of the spark - if your lucky you'll be able to see the point of failure. The other end will be two different colored wires that run to the corner of the screen.
If your lucky enough to see the point of failure, each part should be labeled with some identifying part number which will allow you to find a replacement. If there is no visible point of failure, assume it is the inverter, as it is the cheapest part to replace (again a local computer repair shop should be able to test this).
If you don't feel comfortable doing it, by all means, support a local business
If it were in my shop, it would be $40-$50 + part.