Hi! Bought an Asus Gtx 750ti, a model with one fan, for my Mac pro 3.1 (2008). Im on 10.11.4 with divers supposed to work. I can see both the original card and the 750ti in the nvidia web driver. I have both installed in the computer. But i get no signal from the 750ti to my screen. Not via dvi or hdmi. And i want to use dual-link dvi. Should i return it and try an other card? Read that some ASUS Cards might not work and so on. Theres a EVGA 750ti availible second hand here.