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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro turns on no screen no light on keyboard

Hi all

i got issue with Mac Pro 4.1 upgraded to 5.1 , 2 x 3.33ghz 96g ram gtx285

problem is Mac turns on fan spin I can hear hard start spinning, graphic card fans spin But nothing on screen and No light on keyboard

problems started after I tried to clean the keyboard and Mac was off but keyboard was connected to front panel

I changed front panel , I changed power supply

When I press Diag all led on motherboard is green except 5V STBY which is yellow

I don’t know what else to do

I have tried to reset power management on motherboard as I don’t get any light on keyboard

I have done most thing on user manual, again I have changed PSU

I have clean and brushed motherboard to make sure nothing extra on board

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Problem solved I changed CPU and Mac working again

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mehdi 将永远感激不已
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