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Mid 2010 Model A1278 / 2.4 or 2.66 GHz Core 2 Duo processor

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Computer doesn't boot after RAM upgrade

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?

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I have the exact same issue

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Michael do you want a different answer?

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Just to finish off the thread, this computer was retired a short while ago without every really finding a solution that completely worked.

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Install the RAM and do an SMC reset upon boot up.

  1. Choose Apple menu > Shut Down.
  2. 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.
  3. Release all keys.
  4. Press the power button again to turn on your Mac.

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Unfortunately that yields the same results. SMC reset appears to happen since the status light on the charge connector changes color but the computer still will not boot with both new memory sticks installed.

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please confirm that it will boot with a lessor amount of RAM.

I am concerned about how the drive got formatted given Apples new and if it did APSF or GUID.

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Yes, it boots and runs (I'm using it to type this) on the old RAM. Since my last comment I tried three additional times, one of which resulted in the three beeps (bad RAM?)

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Now that sounds like a piece of RAM that has had an ESD hit. It can be one of the most exasperation things to find. But there is a new software tool that may help:

https://www.micromat.com/products/atomic

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The part that still bothers me is I can use any of the new memory paired with any one of the old memory and the system works fine showing the expected 10GB of RAM. I guess that also points to something may be weird with the new RAM. Since I’m almost to the end of my return window, I’ll take that route and then update after the new pieces come in. If I have time, I’ll check out the test utility for comparison.

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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.

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memory bus speed with old sticks says "1066" my new sticks are 1333. However, 2gb@1066 PLUS a new 4gb@1333 work (both 4gb modules new ram work) BUT 4gb@1066 (old 4gb ram) PLUS 4gb@1333 (new ram) does not.

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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

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