The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Any way to fix Backplane 661-4996

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.

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Chosen Solution

Check the diagnostic lights

Location Name Color Status Indicates

LED 1 Yellow On Yes Power supply is

providing trickle


LED 2 Red Off No CPU B halts

on an IERR



LED 3 Red Off No CPU A halts

on an IERR



LED 4 Red Off No CPU B is over


LED 5 Red Off No CPU A is over


LED 6 Green On Yes EFI has configured

the graphics


LED 7 Power on Green On Yes All power rails

are functioning

LED 8 EFI done Green On Yes EFI is done

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