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Ventura, Monterey, Big Sur, Catalina, Mojave, High Sierra on HP 800 G1 USDT,SFF and Tower PC's

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  • 2 weeks later...

So the HP 800 G1 i setup for family member back in 2019 is looking for an update.

I decided to download Monterey 12.6, put the installer on a USB

then copied your EFI from 1st post into the EFI partition

then tried to boot from the USB

and the system isn't booting, after I select the USB to boot from it just shows a screen stating TRYING TO BOOT FROM USB

and thats it.


what am I doing wrong?

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  • 7 months later...
  • 4 months later...

Hi all


Recently I've been experimenting with Monterey via HP_800_G1_075.zip.  Although it works fine with a single monitor (connected via the onboard DisplayPort) as soon as I connect a second monitor (also via onboard DisplayPort), I get the following on the EFI Boot screen:




The error text reads:

OCC: Failed to set mode 2 (prev 1) with 1920x1200 resolution.  Halting on Critical Error.

I'm hoping that there might be some quick / easy fix for this ?  For the last three years I've been running on HP_800_G1_OC_58.zip with Mojave with Dual DisplayPort monitors, so I'm pretty sure that the hardware should be able to do it under Monterey.  Unfortunately I don't know enough about OC and customising the EFI.


@Donw35: I can't thank you enough for your amazing efforts with supporting HP Elitedesk 800 G1.  It's been my daily driver for 3 years - and preforms better than my Intel MacMini.


With Many Thanks



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