Consistent POST Error - 517 Memory configuration requires a Memory fan and this fan is not detected

[seasoned_geek1]

This was working fine. I cleaned the dust out of it with air and it ran fine. Then it tossed up 517 error about a month later. I replaced all 3 fans today with brand new ones from the factory in China. Still got the 517 error. The assembly appears to seat properly. Panel goes on and everything. I mean, between this starting and the last time the case had been open, everything was fine. Then I reboot to install openSuSE Leap 15.x and I start seeing the 517 error. 

I'm not going to install Windows to run some diagnostics program. Professionals don't use Microsoft products.

[DGroves]

actually professionals use whatever is necessary to get the job done...............

i would recommend installing  the HP Performance Advisor Software

https://www.hp.com/us-en/workstations/performance-advisor.html

and run it under a windows live CD, to query the system fans operation

You could transform the Windows 10 ISO to Live Windows (or Windows To Go) using the program WinToUSB

or use a linux based app to query each fan sensor and then determine which sensor maps to what fan which is more troublesome than the HP's graphical advisor software

this will show which fan is spinning slow or not at all during operation

btw, 517 error is for the memory fans in the main black cooling shroud which i believe you are already aware of

[seasoned_geek1]

As previously stated, all 3 fans are brand new. Installed yesterday right after they arrived direct from the manufacturer in China. (Only place to get them new. Everybody else is selling used.)