crwdns2934241:0crwdne2934241:0 Tom Higham

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I tried the same size = same DIMM configuration (as above comments suggested it would be quicker) and my machine wouldn’t boot. Turns on but screen stays blank. Had to revert to installing by BANK. Any suggestions as to why?

iMac 27’ retina late 2015

2x stock 4GB DDR3 1867Mhz

2x OWC 16GB DDR3 1867Mhz

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open