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Charlieth18

macrumors newbie
Original poster
Jun 5, 2020
2
0
Hey Guys,

I am new To this forum though I read a lot here before. I currently concearned about my Mac Pro early 2009 with 2x Xeon 5675 CPUs which is not booting anymore since I have changed CPUs from Xeon 2,33 GHz to the 5675s with 3,0Ghz 6 Core. The fron led is flashing constantly fast. CPU trays don’t show the read lights which means I mounted CPUs correctly. I used thermal paste as described and even changed ram panels. I am currently using old 1033MHz ECC ram 4x8GB and ordered already new ones from Samsung as I thought it might be the ram. But I also changed ram slots and tried even using one or two rams only. Nothing worked. The problem is that the rams worked before changing cpus. Is there anything I am missing out? Thanks for you help.
 
Have you flashed the firmware from the 4,1 to the 5,1 firmware you need the the newer firmware to run newer CPUs
 
Thanks for your replay. Yes I just should have said this. I am currently running Mojave.
 
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