820-3437 try to spin. All rails are ok.

[BCN_Techs]

clean me with medusa, and dump from internet. Tried both options

Anyway is it possible that PCH can fail like this?

 

[2informaticos]

Yeah, could be.
Check if ASD EFI reports something about Management Engine.

Also try the machine with Linux and Windows.
You may sell it as reversed HackIntosh...