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I purchased the RAM upgrade kit for a 2010 13” MacBook Pro model A1278 (2 x 8GB sticks), however the computer won’t boot after both sticks are installed. The white light lights dimly, but nothing else, including any beeps or tones. I think the new RAM is ok because I can use any combination of 1 old stick (2GB) and 1 new stick in any slots for a total of 10GB and the computer reflects that configuration as expected. SMC was also reset but I had to use the unplug the battery and hold power button method. Computer is running a fresh install of High Sierra 10.13.6 on a new SSD that was upgraded right before RAM issue. Any thoughts or should I just return it for a new set?
Install the RAM and do an SMC reset upon boot up. Choose Apple menu > Shut Down.After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds. If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.Release all keys.Press the power button again to turn on your Mac.
The issue is the clock speed. Probably, your device only supports a maximum of 1066MHz. When combining an old one with a new one, the old one limits the clock and that’s fine and the reason why it works. Same happens to me. I hope this helped.
Your MacBook may not support 8GB RAM (4GB slot each). But up to 6GB can go. 2gb for slot and 4gb for slot 2. visit: www.papcy.com
