Do you have anything else that outputs 4K video, at least that would tell you if its the TV or the PC.
You could try messing with the
CRU but that can be complicated but perhaps it can correct something wrong in the EDID.
- Set your desktop res to 3840x2160 60Hz
- Run the software and on its main screen you should see a detail resolution section with the 3840x2160 60Hz res listed, select that resolution and click on edit
- Under Timing from the menu select "Automatic HDTV"
- Hit okay then okay again to close the software
- Run restart (32-bit OS) or restart 64 (64-bit OS) to apply the change.
If nothing changes go into resolution section of GPU driver and select the 2160p 59hz output if thats there instead of 60Hz.