Getting a black screen when i run 3dmark vantage

Hey guys, im trying to run a benchmark on #DMark Vantage, but as soon as i start the benchmark my screen goes black and nothing happens.

My sustem is:
i7 930
Win 7 64bit
2x geforce 250GTS (driver version 257.xx)
asus p6t motherboard
12gb axe gaming ram

Any help would be appreciated.
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More about getting black screen 3dmark vantage
  1. have you overclocked your card?
    also which PSU do you have?
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