Not sure if this is the place, but maybe someone has an idea why this setup isn't working. I have a USB-C -> DP Cable and a USB-C -> HDMI 2 cable. When I use these cables on my 2017 Macbook Pro 15", they work great. 4k @ 60hz without an issue. However, when I use these same cables on my new iMac 2017 5k 27", nothing. The monitors (tried 3) are not detected and nothing flickers. Now, if I use an Apple USB-C Digitial AV Multiport cable on the same iMac, it works fine over HDMI, but ofcourse I can only get 4k @ 30hz which I cant stand. Any ideas why my these cables work on my MacBook but not on the iMac?