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How do I connect a third monitor to my PC.

HP Recommended
HP Envy desktop 750 279na
Microsoft Windows 10 (64-bit)

I'm trying to connect a third monitor to my PC HP Envy desktop 750 279na. There are 2 HDMI ports not in use (HDMI 1 and 2) but when I connect the third monitor to either it's not  detected. I have connected the monitor to another port and it works fine so its not an issue with the Monitor. Any help would be greatly appreciated 



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