6870 hdmi

Morning, fellas. I've had this problem for a month now, just getting around to asking you guys about it. I've got a High Sierra hackintosh with the radeon 6870 Reference card. The DVI Ports work fine, I'm using it with one monitor, and the HDMI USED to work fine on my 42" Samsung. However...

Hi, I've a GIGABYTE GV-R687OC-1GD Radeon HD 6870 1GB 256-bit GDDR5 on a ASUS P8Z77-I Deluxe LGA 1155 Intel Z77 motherboard. I've a main display connected to a DVI port. I would like to connect a TV to the HDMI port and get video and audio on that TV. I've plugged in an HDMI cable, but...