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Can't have 2 displays on boot


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Hello,

please I'm experiencing a strange behaviour with my HP 800 G1 and displays connected with DisplayPort.

If both my displays on, my Catalina won't boot.

In order to boot, I need switch on my primary display, switch on my HP. Once booted, I need to switch on my secondary display.

If I don't follow this sequence, either MacOS won't boot or get stuck loading

 

Please do you know what could be wrong?

Regards

 

 

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