I tried to add 16gb to MBP mid 2012 (non retina)
When trying to upgrade to 16gb MBP the result was disastrous. The system would become frozen on a scrambled (and flashing, not artifacts) screen with part of the window and part of the desktop intermixed. Since going back to the 8gb of the same manufacturer memory (corsair) I haven't had any problems. Is there something I can do to check the memory? In the "about this mac" window the 16gb was shown and listed as "ok"
Any ideas what could be the problem?