4Lay the card flat, then gently press the card into the socket.
You need to exert some pressure to insert the card’s connector into the socket. It’s all right to wiggle the card to move it or to insert one side and then the other, but be very careful not to bend or bow the card.
Check to see that the RAM card is properly seated in its socket. Press down firmly on these two areas.
Check to see if either of these keyboard cables has been pulled out of its socket on the logic board.
Appendix C