オリジナル投稿者： lemerise ,
There's a documented ram slot issue on the MBP 13" 2012. The lower slot often fails. If you check inside your back panel you'll see that Apple installed a pad over the ram slot to compress it. If your MBP works normally only using the upper slot then install a 8gb ram stick in it and use it as is. Other option is to replace the logic board.