martinlangley Posted March 14, 2019 Share Posted March 14, 2019 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? Link to comment Share on other sites More sharing options...
LouCioccio Posted July 21, 2020 Share Posted July 21, 2020 Go here http://tim.id.au/laptops/apple/macpro/macpro_mid2010.pdf Troubleshooting chart is there Lou Cioccio Link to comment Share on other sites More sharing options...
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