Sorry, I cant help really, but it sounds like maybe you need to upgrade your graphics card? Er, speaking in my total ignorance, I assume you have tried to configure the graphics? I cant remember if there was a button for that on install.
It may be worth reading the 'readme' file 'cos I think it says something about blank screen in there.
Sorry not to be of real use
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Smile! Life is too short for bitching!
Fljotsdale