No crossfire on Z77MA-G45 with 2 x HD5770 Hawk

Hi,
I recently bought a Z77MA-G45 for my wife to get some more life out of my dual MSI Radeon HD5770 Hawk setup while still managing to squeeze it into her mATX case (it has swarovski crystals on it, so swapping it out was a no-go...). For some reason though, only the GPU in the primary PCIe-slot works, the second is not detected.
I have tried swapping the cards around, swapping the power connectors around to no avail, whichever card is in the first slot, only that one will work, however it does work flawlessly as a single GPU-setup with no issues whether or not both cards are installed. I also tried updating the BIOS to v1.9, and tried with the PCIe Gen 3 setting both to "Auto" and "Disable", neither works.
Would anyone here have any insight as to what is going on? My guess is the motherboard somehow does not detect that I have 2 GPU's installed, and therefore does not split the PCIe lanes to both slots, but if this is the case, I cannot find any way of forcing the board to do so.
Thank you in advance,
Preben

Now if only all my computer problems could be fixed with a magnifying glass and a darning needle...
Thank you very much for the tip, the offending pin has been brought back in the fold, and both cards work perfectly at PCIe 2.0x8 as expected - in fact with a CPU upgrade, that setup is benchmarking a lot better than I would have expected... 

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