Screen turns black, computer is running, but screen stays black...

Hi Everybody, i could do with your help...
I will try to discribe the problem,.. if the screensaver comes on after 15 minutes, and i try to wake the computer, the screen turns black, like it would when turned off... you can hear the computer is on and running, but nothing on the screen, touching the mouse pad, or any button on the keyboard will not wake the computer... if i than close the lid, i can see the little white light and when i reopen the lid.. nothing.. sometimes briefly like a millisecond or so, you can see the screen on, but than goes to black again....
Any ideas??
it does not happen when working on the computer, only when it comes out of screensaver, or if left alone for longer than 30 minutes or so.... really strange...
Anyway, your help is appreciated!!!

Harry,
Did this just start happening after your update to 10.6.3? There is a thread over in the OSX Snow Leopard area about the backlight not coming back on after sleep that might interest you. Here is the link ( http://discussions.apple.com/thread.jspa?threadID=2384628&tstart=0 ).
Hope this helps,
BCB

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@jck & @awaller well not literally every other time, it occurs randomly. sometimes I can work for like an hour or as long as I want and nothing happens, sometimes after 5 minutes *boom* the screen goes black, except of one column with random pixels, i tried to switch to a different console with ctrl+alt+(F1-F6) but it did not work...
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