6674T not detected when trying to sinc 2 chassis (both with a 6674T)

Hi all, I have a problem when I try to sync the 2 PXIe 1085 chassis. Both of them are equal, they have a timing card 6674T in the slot 10 and 3x5645R (ports 2, 6 and 11). Each chassis works fine individually, so I can for example tx 1 and rx 2 (in labview 2014), but when I try to connect both chassis the timing cards are not recognized by windows (Windows 7 64 bit ) and I cant access anything. I have tried several combinations of wiring the Clock-out to Clock-in, PFI 0 to PFI 0, PFI 1 to PFI1 (this 3 at the same time). But none of the combinations worked. Just for clarification, when I work with 1 chassis I switch on first the chassis, then the PC and the timing card and the other slots are detected. But when I wire 2 chassis, turn them on and then the PC , then nothing is recognized Any advice is welcomed. Have a nice day jser