I have a GTX 750TI graphics card with a AMD FX 4300 Quad Core processor and 8 GBs of Ram. MY HDMI cable works for my TV, but I wanted to add a monitor as well. I have tried 2 monitors, both of different companties (Dell and HP) And both work on other computers. The cable I'm using works as well. But my computer won't detect either monitor when hooked up.