DisplayPort connection never working

I bought two DisplayPort expansion cards with my laptop. I cannot get either of them to work, meaning Windows will not recognize an external monitor when I have them connected. I am using a DP to DP cable. I have tried turning the computer off before putting the expansion card(s) in. I’ve tried each step with both expansion cards, so if it’s a bad card then I got two bad ones. HDMI expansion card works just fine.

What else can I do to diagnose this?

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