Is Display Port not compatible with other cables for dual monitors??

I used to have a couple HDMI's and a VGA converted cable to connect three monitors. Ever since I got a new graphics card with a display port cable, I have been unable to get another monitor to work using HDMI or VGA for them.... If they aren't compatible that is bullshit and I would call Display Port a... show more I used to have a couple HDMI's and a VGA converted cable to connect three monitors. Ever since I got a new graphics card with a display port cable, I have been unable to get another monitor to work using HDMI or VGA for them.... If they aren't compatible that is bullshit and I would call Display Port a downgrade.
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