Hello I'm working on Macbook Pro and playing games on PC

My Macbook setup is one U2717D and one U2412M + macbook screen.

On my U2412M i have the Macbook connected via Displayport and PC connected via DVI. Everything worked like a charm with my old card(which was integrated) i was able to switch between Macbook and PC from the monitors panel. Today i updated my video card to GeForce Gtx 1060 3gb used the same DVI cable from my old video card and now when i switch the input source from Displayport to DVI via monitors panel it works, but when i switch it back from DVI to Displayport the monitor (U2412M) starts flickering (looping black screen then Dell logos screen then again black sceen) Other two displays start to flicker too (U2717D and Macbook Display) They flicker Desktop to black screen. After i unplug the DVI cable from the monitor(U2412M) everything starts working.


Is there anybody that can help? Thanks in advance!