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You can crossfire...but only if your previous card is a 68xx series as well. You can only crossfire a card in the same series. For example, you can crossfire a 6870 and a 6850 but not a 6850 and a 5970.
i doubt its shorted. im sure you have but i ask any way. You have reseated the card and tried it with a new VGA cable? If it still doesn’t work double check the pins did not break off in the VGA port on the card. It would also be easyer to tell you if the two cards were compatible if we knew what the original card was. We know your getting a asus 6850 but what would you be attempting to hook it to in crossfire