Third monitor not detected by windows over HDMI

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Nov 23, 2014
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So I have a GTX 770 4GB card, using the two DVI outputs for two monitors already. I'm trying to use the HDMI for a third, but it isn't being detected despite all indications online saying this should work fine.

The stranger thing is that the card seems to be detected by the TV, but it simply puts up a black screen & windows doesn't pick up on the monitor at all.

I've tried force detection with the nvidia control panel as well, which got me nowhere. Anyone have some suggestions?

I'm going to try rolling back my video drivers for now, but I don't know if it will help.