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HP EliteDesk 800G2 Mini

We got a couple of 800G2 Mini desktops in to refurbish. Like all our refurbs, one of the first things we do is hit F10 and reset the BIOS and clear the security to defaults. 

So we did that on these two systems and now they're stuck in some kind of POST loop. We get the HP logo and "Rebooting system to make TPM2 settings in effect" in the upper left corner of the screen. The system then powers off and tried again. 

We tried resetting the BIOS using the CMOS button inside (press for 5 seconds). No change. Trying to find some method to break out of this... Tried removing the PSWD jumper, but the systems wouldn't even display the HP logo.

Has anyone ever seen this before? I found very little reference online, but it seemed mainly Dells and the only solution was replacing the BIOS chip... sigh. 

 

Did we seriously brick both of these desktops trying to reset them to defaults?

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