Cant set 4k resolution on my gigabyte 1060 G1 card

[rrrichar061253]

I have bought a gigabyte gtx 1060 G1 3gb card. My computer is connected to a 55inch sony 4k tv using the HDMI port. When i try to adjust the resolution above 1080p, I just get a black screen, till it reverts back. I have reseated the card, checked the hdmi cable with a 4k player, the power supply is 850watts, processor is AMD FX6100 and system has 16Gb memory. Has anybody got any ideas as to what is wrong. Thanks

 

[vapour]

how did you adjust the resolution? on TV or on PC?