Q: Mac Pro Not Booting Just pwer Led Blinks white

Hello

My Mac Pro ( A1289 ) 64GB RAM automatically Stop Booting , Just Power White LED Blinking when i press pwer . i hear fans,Hdd,Dvd working . Black Screen Empty . I Google it . all talk about RAM . i remove it and try it one by one and i remove VGA cards also . i remove bios Battery . i press small buttons on the board . SMC.PRAM i try it also .Remove Bluetooth ,WIFI Cards Also .

Still Not working . AnyHelp Pls

Thanks

Mac Pro, iOS 9.3.5, A1289

Posted on Sep 9, 2016 1:45 PM

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Q: Mac Pro Not Booting Just pwer Led Blinks white

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by Grant Bennet-Alder,

Grant Bennet-Alder Sep 9, 2016 2:26 PM in response to TamTamo
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Sep 9, 2016 2:26 PM in response to TamTamo

A1289 is Mac Pro 2009 through 2012 or Mac Pro 4,1 and 5,1.

The blinking power light, especially in groups of 3, is an indication that there is not enough RAM that is working to start up.

The memory DIMMs are Not installed in pairs. Each groups of 4 slots on the mainboard at the bottom of the chassis is semi-independent. It should boot with as few as one DIMM, possibly one DIMM on each side.
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by TamTamo,

TamTamo Sep 10, 2016 10:15 AM in response to Grant Bennet-Alder
Level 1 (4 points)

Desktops

Sep 10, 2016 10:15 AM in response to Grant Bennet-Alder

Recently I Change the mainboard with Ram and CPU ( i take it from other working mac and try it ) its same problem not booting and blinking power light .
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by Grant Bennet-Alder,

Grant Bennet-Alder Sep 10, 2016 11:41 AM in response to TamTamo
Level 9 (60,774 points)

Desktops

Sep 10, 2016 11:41 AM in response to TamTamo

In that case, perhaps the power connection to the board is not right.
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Q: Mac Pro Not Booting Just pwer Led Blinks white

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by Grant Bennet-Alder,

by TamTamo,

by Grant Bennet-Alder,

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