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Can't connect monitor

HP Recommended
EliteOne 800
Microsoft Windows 10 (64-bit)

I am trying to install a second monitor for a call center job, but the PC and new monitor (LG 24MK400) are not finding one another. Connection is via HDMI cable. HELP

The EliteOne is new to me, although an older model that has been refurbished. It originally was loaded with Windows 7, apparently.

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