RAM freezes and crashes my iMac after upgrade to iMac late 2015 Recently I purchased 2 RAM carriers from a local supplier:
Micron Memory Upgrade 8GB 1867MHZ DDR3 SO-DIMM PC3L-14900S (8GBx2)
I wanted to upgrade from my current 8GB to 24GB.
However, a few days after installing, I ran into the screen going weird (for a few seconds). Please see the attached picture.
In addition, today the screen went blank for a few seconds, then came back but I couldn't interact with it at all, then I had to manually restart it by pressing the on button. And tonight, my iMac just restarted itself for unknown reason.
I used Memtest86 to scan for errors (for the whole system). After 6 hours, it found nothing, RAM included. I also used Rember software to double check if RAM are working probably, and again, found no errors. Lastly, I used Mac's diagnostics by pressing D when the computer is turning on, and it found no errors.
These issues never occurred during the 6 years I've been using it, only almost right after I installed these 2 pieces of RAM, so I assume the problem is the RAM.
What could possibly be the problem? Is it the RAM? The RAM slots? Any advice is appreciated.
You could always take out the RAM and see if the problem still occurs. It could just be a coincidence that the problem started after the RAM was installed, in which case you've got another problem!