crwdns2934241:0crwdne2934241:0 johnnegrete

crwdns2934249:0crwdne2934249:0:

This thread was helpful. I had to try every combination of configurations, i.e. ram chips in different slots, until it worked.

I had 2 - 4GB OEM RAM chips installed in slot 1 and slot 3.

I bought 2 - 8GB OWC RAM chips and it finally worked in this configuration:

4GB/8GB/8GB/4GB

Machine is 27” iMac Retina

crwdns2915684:0crwdne2915684:0:

open