So I've recently installed a new Sapphire RX 570 and was using a different Asus RX 570 before that (which broke, unrelated); please note that I did not have this issue with the Asus model nor with my old Nvidia graphics card I was using just a week ago so I have ruled out a bad cable or the monitor
When I switch my monitor (in the monitor's hardware settings via physical buttons mounted on it) from 60hz to 144hz, I do not get a display signal in Windows
I can see the BIOS menu and pre-boot information, but as soon as I get to the Windows login screen the display drops out and all I see is black.
When I switch my monitor back to 60hz I can once again see Windows... but I would really like to use my monitor at 144hz as that is why I bought it
Affected monitor is a Samsung C24FG73 connected via Display Port, with two additional monitors connected with HDMI and DVI (other monitors still have signal when the C24 drops out)
i5-4690k, Sapphire RX570 Pulse 4GB, AsRock Z97 Extreme 4, 8GB Kingston HyperX DDR4, 120GB Samsung 840 EVO (boot drive), 1TB Samsung F3 (storage), Corsair HX850
Windows 10 Pro x64 1803, AMD Radeon 18.12.2