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donnie, the dual 7800's could definitely be the issue. on a quick search i can't seem to find anything on using dual video cards, which either means that no one has any trouble with them or nobody uses them! definitely try what johnny said, although it does pretty much mean that you are gonna have to figure something out.
if you really want to test it out, try removing one of the cards to see if it just doesn't like the dual card set up.
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