Have the same problem for the past two days. Having four identical apple OEM rams but the system won't turn on with all four slots installed. It will with 3, with 2 but not with 4. Also, it doesn't matter which order you put or which ram of the four one you installed. All of them are working in pair of 3s or 2s but not all together. I am really bamboozled.

Have the same problem for the past two days.

Having four identical apple OEM rams but the system won't turn on with all four slots installed. It will with 3, with 2 but not with 4. Also, it doesn't matter which order you put or which ram of the four one you installed. All of them are working in pair of 3s or 2s but not all together.

I am really bamboozled.