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HP Z23i Monitor No Signal Found message when connected to laptop

HP Recommended
Microsoft Windows 10 (64-bit)

Hi I picked up 2 HP Z23i monitors used online and can't get them to recognize an input device. I have tried connecting them to 3 different laptops with several different displayport cables and it won't receive a signal. This is an issue on both monitors. I cannot find anything in the settings of the laptops or the monitors that would indicate an issue and am looking for some help! Thank you in advance 

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