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pci express root complex and undetected graphic cards

Im using M17x R4. I update my win8 to win8.1 and I aware graphic cards issue there. I tried couple of nvidia drivers still unable to solve the undetected graphic cards, as you can see there's only one Intel Graphics 4000 there.  I called Dell tol support for graphic cards (2GB GDDR5 Nvidia Geforce GTX 660M) assistant and they ask me format my win8.1 to win8 and reinstall the drivers. End up same result. And I aware an unknown device there, it said "pci express root complex".request for assistant and guides asap... thank you.

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