MacBook won’t detect RAM

Do review this guide if you have’t MacBook Unibody Model A1342 RAM Replacement. You might want to use a fresh pencil eraser (still soft) to wipe the contact’s as there could be come tarnish on the module, also make sure the module is fully inserted into the slot.

You could see if loosing the two screws which hold the carrier helps, besides that, the latches may not be holding the modules tight enough. You could try taking a cut up plastic credit card, a small strip of 5mm which you can slide under the latch and between the module.

Beyond this is will require replacing the logic board as the carrier part is a rare part and it’s not easy to replace logic bd P/N 661-5640