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Cannot activate Secure Boot in BIOS for ProDesk 490 G2 MT - to install Win10 via PXE

HP Recommended
ProDesk 490 G2 MT

Hi there,
I want to enable Secure Boot and disable Legacy Boot in BIOS, but after changing this setting, the PC starts with a black screen. Nothing I can do (the LED from NUM and the Mouse LED ist turned on with continuous light ). So I have to unplug the system fom prower and clear the CMOS. After that I get the "changing screen" as discribed in the manual (Figure : Boot mode change message). I updated the BIOS to the latest version with no effect.

Any help is appreciated, thanks in advance

 

Cheers,
SKFritz

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