Chosen Solution
Is there any way or guide or anything about how to fix the 661-4996 backplane of the 2009 Mac Pro 4.1? The question is easy as that, my mac just died, and tested all the elements on other mac pro, worked, except for the backplane, it just won’t turn on, it should be easy to replace it but apple has stopped manufacturing those parts, so I need to fix it, I really don’t know how, so I need help with that.
Check the diagnostic lights Location Name Color Status Indicates LED 1 Yellow On Yes Power supply is providing trickle power LED 2 Red Off No CPU B halts on an IERR (instruction error) LED 3 Red Off No CPU A halts on an IERR (instruction error) LED 4 Red Off No CPU B is over temperature LED 5 Red Off No CPU A is over temperature LED 6 Green On Yes EFI has configured the graphics card LED 7 Power on Green On Yes All power rails are functioning LED 8 EFI done Green On Yes EFI is done
The only solution is exchange the backplane, the best solution choosed is ridiculous.
