The built in screen in my Macbook keeps blacking out, even though the computer is on.

Hi
The internal screen on my Macbook keeps blacking out; when this happens the computer is still on - just no screen. This happens when unplugged after a few seconds, and takes a bit longer when plugged in.
If I close the lid and open it again the screen works again for a few seconds before the blackout returns. Obviously this is not the ideal work scenario!
It does not appear that this is a backlight issue (I presume) as I cannot see any image on the screen when this happens from any angle.
If I turn the brightness all the way down and then back up again the screen flicks on for a fraction of a second before anything happens again.
Any ideas what might be causing this? If I can fix it? And/or how much an Apple repair of the problem is likely to cost.
Many thanks for your help!
Martin Faint

Unfortunately it sounds like the logic board... happened on a MB I have at work. That's an Apple Store replacement, and can be expensive if your mac's out of warranty. Free if it's still covered...

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