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Hi I have an ageing Mac Pro A1289 (5.1). When stripped down to the motherboard and (bare) processor card the diagnostics are fine. When the processor card is populated with a single processor, the front panel light flashes and the machine fails. How do I find the cause of the issue?

 

If this is due to a matched pair of processors not being fitted, how does the system know this on the basis of only one processor?

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