Backlight goes off... but only on higher brightness. What does this mean?

I have an early 2008 13" macbook and all of a sudden, the backlight went off. I can still see the screen using a flashlight. I tried resetting the PRAM and holding the power button for 5-10 seconds with battery out and power cable unplugged. Nothing. I figured out that bringing the brightness down all the way and then back up a notch turns it back on. But unless I keep the brightness at 1-4 notches, the light goes off after 10-30 seconds. At this point, I have no idea what to do.

Have you tried resetting the SMC as well as the PRAM? Here is the link...
http://support.apple.com/kb/HT3964

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D

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tt2

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Backlight goes off... but only on higher brightness. What does this mean?

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