Faulty RAM Slot not allowing machine to boot
I have a late 2011 15" MacBook Pro that at the end of 2016 had the logic board replaced under the GPU replacement program. So the Logic board is 7 months old. The computer is in great condition, never dropped or misused. Randomly the machine wouldn't start and it was giving me the three beeps, signaling a RAM issue. I tried reseating, replacing, cleaning the sticks and the slots. Nothing. Then I used just one stick and it worked. The bottom slot (when the computer is laying on its lid) is faulty and is not allowing the machine to boot, it'll only boot with one stick installed in the slot closest to the back case. What can I do to make both work? Or is one 8Gb stick a good option, will it perform as if there were two 4Gb sticks (Im worried that if one slot has went bad that the other will too.)? I'm very upset that a virtually new logic board is having this issue and that apple refuses to work on it because it is "too old".
Replacing the logic board is a way to costly option, so not really an option.
Ive tried loosening the logic board screws, as some have said that that has helped the slot read the ram, nothing.
Has anyone else encountered this issue? What did you do. What do you recommend?