Help with PCI-E on asus a8n sli deluxe

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Joined
18 Dec 2004
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235
Location
Northern Ireland
hi guys, recently got an asus a8n sli deluxe skt 939.

When i was setting it up and had my 7900gs in the blue (top) pci-e slot, there was no signal coming from my card to my screen.
So i put the card into the bottom slot (black) and tried it, it worked fine. But now if i run graphics-z, it says my pci-e is running at x1 and not x16 like it should be. Is this because the bottom slot is only used for sli cards and the top is the primary slot?
If so how do I get the card working in the top slot? Do i need to change anything in the bios.

This board was 2nd hand so maybe the person who had it before me has changed some setting? Or is there a common problem with the x16 slot at the top breaking?
 
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