HP Elitedesk 800 G4 not displaying anything

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  • onix331
    birb
    • Jan 2024
    • 6
    • Somewhere in the solar system

    #1

    HP Elitedesk 800 G4 not displaying anything

    Heya,

    found three HP Elitedesks 800 G4 65W Desktop Mini PC's on the scrap, however they refuse to display anything.
    The fan spins, power draw is about 9-10W, the LED is a solid white. However when i hold the power button, it starts to blink red 3x, white 4x.

    Attaching a keyboard does not make the caps/numlock LED light up either.

    I replaced the CPU and RAM but no luck. When i try to power a HP Elitedesk 800 G3 with the same PSU, it works.

    What am i looking at, is this known at all? Borked BIOS somehow? Or why do these G4s just all fail.
    Would be nice if i didn't have to bin them (again).

    --onix331
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