I have a brand new Z8-G5 (not Fury) that has VERY WEIRD startup behavior from either a cold boot or Win 11 "restart":
- Cold boot takes approx 3:50 to get to a logins screen (fresh Win11 install), a time I've not seen since a 1980's Apollo workstation running Unix. At the 1:06 mark during the boot cycle, the POWER GOES OFF FOR ~0.75 SEC then turns on again and the boot process starts over until at the 3:50 mark a login screen appears.
- Restart (warm boot) takes as long but the machine runs in "black screen" mode (monitor on but only black signal) after which the Wolf screen displays for the remaining time until the Win 11 login screen appears.
It seems trivial but you may want to check Windows power plans if you haven't already. My system defaulted to one that was geared more for laptops as it put the machine into hybernation requiring a fresh login after about 10 minutes unattended.
My guess is that this is all tied to overly-intrusive and poorly engineered Wolf / "HP Sure xxxxx" crap. During the first 3 days of trying to restore / reconfigure the system as the replacement to my Z840 that went **bleep**-up (due to a Windows 10 Update error that lead to an unbootable / unrecoverable system) it seems Wolf was using some A(not so)I to "improve" my security by increasingly blocking simple actions like recovering files from backup, copying files from an external to internal drive, opening pdf files... So I had to uninstall all Wolf / HP Sure xxx stuff from CP "Programs and Features" so I could work. Unfortunately I believe most of the boot trouble and inability to run PCIe cards compatible with Win10 / Z840 are due to Wolf / HP Sure Start and Secure Boot "protection" built into the BIOS.
Also, since Day One I have the error event ID 7000 "The l1vhlwf service failed to start due to the following error:
A hypervisor feature is not available to the user" despite the fact that I do not have ANY of Hyper-V / Hypervisor features checked in CP->Programs and Features->Turn Windows features on or off. Yet this error appears during every boot along with other Hyper-V / Hypervisor virtualization warnings. Those, I believe are left over from Wolf / HP Sure xxx settings within Windows security framework that are not removed when the applications are uninstalled.
If you have the time and inclination you might try removing all the Wolf / HP Sure xxx crap, remove any PCIe cards not installed by HP (they seem to have set Secure Boot, Sure Start and BIOS TPM logic to indentify such cards as security risks to lock out) and see if anything changes.
BTW, hats off - you actually got to a support person. I tried for days after my machine arrived with the wrong graphics card (they substituted a $200 cheaper card w/o telling me, amending the packing list / box-side item list, then refused to swap for the one I ordered - I would have to send the ENTIRE SYSTEM back, wait for them to disassemble it, test all the installed components, return them to stock, THEN notify sales the return was complete whereupon sales would schedule the build of the system I had ordered, in theory with the correct gfx card leaving me without a working system and an increasing backlog of client deadlines.) I only got to talk to A(not so)Is, non-HP employee robo-call center folks who barely speak English, know next to nothing about computers and less about HP products. HP defenses against actually having to supply some competent common sense customer support are excellent.