Black screen while working

last few days my mac got a black screen while working once ort twice a day. no idea why. it's only the screen and there is no way to wake him up. but the cpu didn't shut down and it sounds like he is working correctly. any idea? would make me happy!

Hey enderci,
Thanks for using Apple Support Communities.
If you are not getting video, this articl has as section for no video that should help.
Apple computers: Troubleshooting issues with video on internal or external displays
http://support.apple.com/kb/ht1573#1
Have a nice day,
Mario

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    >
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