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929 MCA error - QPI links problem at starting + blue screen

HP Recommended
Hp Z620
Microsoft Windows 10 (64-bit)



I have a problem with my HP Z620.

I get this message when booting, I can overpass it by pressing F1, the computer starts normally, but after a while I get a blue screen.




If I disconnect my secondary motherboard, I got no problem at booting and no blue screen, but I only have 1 CPU  working and half of my RAM.


I made some RAM tests, everything was OK.


Someone have a idea ?

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