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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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MacPro 4,1 2009 booting first, freezing afterwards no chime no Video

Hello dear forum,

I ve revived my MacPro 4,1 from the death in my basement.

It Starts correctly, chimes and boots in High Sierra but After 2 Minutes / or some load like ‚about this Mac ‚ it freezes and After 1 minute freeze it reboots.

Then it has no video no chime no Boot. So Self Test is Not succeeded.

If you wait some time And start you get the chime back And it freezes earlier.

things i have Tried:

all resets (pram and so on)

diag leds Show everything ok

minimal configuration

Changed Power supply to 100% working one

Any ideas ? Bad CPU which cause Kernel panic?

Please give me your opinions.


best

Adrian

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Most likely similar to my issue with a 4,1 machine. The Northbridge chip is overheating. Check out this ifixit guide.

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After switching the CPUs with similar issue, this is the last test I will try, thank you!

My Northbridge seems to be pretty hot so hopefully this is the solution.

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Adrian Schulte-Zurhausen 将永远感激不已
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