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.