Shadoxity

If it helps, I had the exact same issue and followed this which fixed it

Hey @spike32I have had the exact same issue as you with a probox. After having my box offline while i was overseas from a power outage I put some time into figuring it out and found a fix!!! Ill give you a number of steps that I did, but it could be as simple as this one key thing. Solution Switch to Legacy mode save and restart Go to the UEFI boot order and disable USB boot (The probox seems to come up under uefi USB boot if you remove all the hard drives and this is where its killing the HP bios. But id does not appear as a legacy boot device). Set your unraid USB as the primary boot device for Legacy boot. More detailed steps for the bios: Enable Legacy boot and disable secure boot Advanced > Secure boot configuration > configure legacy support Set to "Legacy support enable and secure boot disable" Save and exit to restart and go back into bios Disable USB on UEFI Advanced > Boot Options > (UEFI and Legacy boot order should be available to set now) UEFI Boot Order Go into this, select USB and push f5 to disable it Legacy Boot Order Set your Unraid USB as the primary boot Save and exit the bios - This should stop it from freezing up That should fix it for you, it fixed mine. I tried a bunch of other settings as well, but doing this finally stopped it freezing up. Now I can navigate bios etc with the probox connected. NOTE: Bios will freeze for about 10seconds or so when the Probox starts up and scans the drives, but then it will continue.