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HP LA2306x monitor screen goes black after boot with DisplayPort

HP Recommended
Microsoft Windows 10 (64-bit)

Hello Everybody,


We're having weird issues after upgrading some of our workstations from EliteDesk 8300 (QV996AV) to HP EliteDesk 800 G4 Desktop Mini PC (2YH11AV) with LA2306x displays.  The old 8300 machines were connected with the old D-Sub cable and all of them woked fine. Since the upgrade we connect the new 800 G4 desktops with the LA2306x displays with displayport cables. SInce then, when you power on the machine, the display wakes up, shows the bios screen, and then goes black while the led still remains blue. If you turn the display off and on, the image instantly appears, 

We tried many DP cables, no change, and unfortunately, the G4 mini has only 2 DP connectors, so we are not able to use the old D-Sub cables.

Has anybody met with this issue? Any tips solving this? 

(I know that the display working, but it's quite inconvenient for our users.)

Many thanks!

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