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HP Z27 27-inch 4K UHD Display

Hello

I own 2  HP Z27 27-inch 4K UHD Display both connected through a DELL docking station with Dual ports cables.

Up until today both were working fine using native resolution 3840 x 2160.

Today something changed one of the monitor (let's call it monitor A) max resolution is 1680 x 1050, the other one (monitor B) still has native resolution 3840 x 2160

No matter what I do, switch the cables, switch the connections to the docking station, use different cable, monitor A max resolution is 1680 x 1050

I turned off my system completely, with DP cables not connected , turned the system back on and reconnected the cables, but still same issue

 

Any help would be appreciated

Thanks

 

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