Checked that the sticks were flush after re-installing the carrier every time.Īfter it worked (fleetingly), I assigned each stick a #, 1-4, based on which slot they were in. If I mixed in ANY combination of OEM chips, with Slot 2 always filled by a OEM stick… the machine booted just fine Slot 2 was the most problematic, because I could only get it to boot with certain chips in Slot 2. I could get things to work with up to 3 sticks (1, 3, 4 and 2, 3, 4), but never (again) all 4. tl dr: I solved this by permuting all of the possible combinations of sticks after labelling them 1-4, based on that 1x boot order. The machine booted 1x and after that, black screen booth. I had this problem when replacing 4 OEM 16 sticks with 4 OWC 32 sticks. I bought 2-16gb Corsair Vengeance RAM as outlined above and configured them like this: I had 2 -8GB OEM RAM chips installed in Slot 1 and Slot 3 I tried several re-installs/configuration changes and confirmed all sticks were seated properly but the problem persisted until I found this thread and John's post. Only problem was, it didn't work initially and was throwing my 2017 iMac 27 3.4 i5 (18.3) into an endless restart/reboot loop. The new configuration would bring me to 48gb of total RAM. I purchased the Corsair Vengeance 32GB RAM: the author suggested via Amazon and installed 2x16gb sticks into blank slots 2 and 4 (I had 2x8gb OEM sticks in 1 and 3). , on the ease/$ savings of upgrading RAM in a 2017 iMac 27". Oh my God! After a weekend of trial and error and lots of online research, John's configuration worked for me!
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