Dual displays, mac screen broken?

I have a mac os x 5.8, and I bought it new about a month ago.
I have been using a dual monitor, and had no problems.
I Turned it off the other night, and in the morning when i tried turning it back on, the screen on the macbook is not visible. It will not light up at all, but if you look hard enough, you can see the faintness of the programs open. I was able to get the displays preference up on the dual monitor, and when hitting Mirror Displays, I am now able to use the mac on the dual monitor.
Does anyone know how to fix this problem?
I have turned off the mac, unplugged the dual monitor cable, and rebooted, and that did not fix it.
Thanks-Dan

It might be that the actual backlight has gone out on your display. If you bought it new just a month ago, I would highly suggest taking it by an Apple Store to get it repaired for free. It should be covered under Applecare.

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