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Hi guys, I am trying upgrade memory on my MP3.1 but if I use 667MHz, I get only red light on RAM board and Mac won’t turn on, I try reset PRAM but no luck :( any ideas ? I am trying Samsung M395T5163QZ4-CE68 4GB 4Rx8 5300F 555 11 AE0 Thanks a lot for any ideas, advice. Pictures below:
Are you sure that is the correct DDR2 EEC “fully-buffered” FB-DIMM memory this system requires. Reference: Mac Pro 3.1 EveryMac specs
