UPDATE: I tried to use Windows 8.1 but it won't allow me to install the drivers for Nvidia and many others since the system is "out of support" according to Windows and Nvidia. However is detecting 2 Devices under Display drivers, both with the generic display. As far as I know, if a GPU is dead it wouldn't show up in the list, right?
I will get in contact with Lenovo tomorrow, and hopefully will get an answer, otherwise, my monitors will be just another decoration for my room :'(