cant change Hz to 180 on display port

[mymicrosoftaccount123]

I have a 1080p 180Hz monitor and I just recently bought a display port which says at 1080p it can run at 240Hz but when I change the Hz to 180 the screen turns off I had the monitor on a HDMI cord and it works fine but I want to connect a second monitor and my pc only has one HDMI port 1. why does it turn off2. why did it work with a HDMI and not a display port

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