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HP G1 800 SFF - enabled secure boot, computer wont come up after restart!

HP Recommended
HP G1 800 SFF
Microsoft Windows Server 2016



i am having a issue with a HP G1 800 SFF.

For testing it has Windows Server 2016 installed, with latest updates.

I know it isnt officcaly supported, but i had the same issue with Windows 10 also.

I have upgraded the BIOS and also TPM firmware.

Bitlocker is on with TPM.


When i enable secure boot computer comes up, but after i do a restart, it goes down, but does not come up - monitor goes sleep mode and stays like that. I have to manually shut down with the power button and then computer starts.

After resetting BIOS to default computer restart properly, bitlocker part also works.

But after enabling secure boot, then doing restart - again same problem, black screen, computer works and manual shut down from the power button.

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