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HP Z8 G4 Workstation

I cannot get the BIOS to recognize any RAM installed in CPU0 slots 1-6. Slots 7-12 and all of CPU1 slots work fine. I have the latest bios installed (2.94) and have even tried reseating the CPU as well as reseating the PSU and MB power plugs.   The MB doesn’t throw any errors. Just fails to even acknowledge anything is in those slots. Is it time for a MB replacement or is there something else I can try?  

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