Lately my screen keeps going black with no warning,what could cause this?

on my laptop, my screen goes black, I can't continue my work. What could this be?

Ok,
This is a 4.1 MacBook early 2008 in white?
First of all, I would try resting the SMC link here on how to do so.
http://support.apple.com/kb/HT3964
See if that provides any solution to your problem.
if not then it's more than likely to be the common fault of the invertor board found in the display housing.
Not a very nice job to replace and advisable to get Apple to carry out the repair for you.
But let hope it's not that.
Best of Luck

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    Binary Images:
           0x100000000 -        0x1022a4fe7 +com.steinberg.cubase 6.0.7.364 (6.0.7.364) <CFFF5ABF-970D-896D-4A88-78FFF87878C1> /Applications/Cubase 6.app/Contents/MacOS/Cubase 6
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