"Issues with bottom RAM-slot MBP 2012"に関する回答Had the same problem with a 2012 13" MacBook Pro. Bottom slot has a bad connection to the logic board. With both RAM slots, in use the symptoms are as follows: displays stripes on LCD, freezing, reboots often, 3 beeps, etc. The computer will work fine if only the top memory slot is used. The only other solution is a logic board replacement.