Released October 24, 2011 / 2.2, 2.4, or 2.5 GHz Quad-core Intel Core i7 Processor

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Why does my ram not work properly

Hi there,

I am struggling with my macbook pro unibody 15" late 2011.

I can start up my computer but after a couples of minutes it goes beeping 3 times pause 3 times pause till i force to go off.

I read across the internet and it says its the ram. So i re-seat it. Doesn't work :(. I also put in new (original apple) RAM and it still doesnt work!

I dont have a clue, can you help me?

(sorry for not correct english i'm from the Netherlands)

Answer this question I have this problem too

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I forgot to mension the RAM is 2 times 2GB


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First, Are you sure you have the correct RAM modules? 1333 MHz PC3-10600 DDR3 SDRAM. Make sure you are using a matched pair (same vendor and series).

It's also possible the socket latches are not correctly latched when you put the modules in. Did you damage the socket when you took the modules out?

Lastly, you could have a dirty contact on the module or socket. Carefully use a short blast of can'ed air to clean the socket. Using a fresh (still soft) pink pencil eraser wipe with the grain of the contacts lightly (do not go across!) Then wipe the contacts with a high grade isopropyl alcohol with a cotton swab (Q-Tip).

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For general information, beeps are used to diagnose a variety of RAM and EFI fault conditions in Intel Macs. Apple's support note lists the beep codes and the cases:

Mac computers: About startup tones

3 beeps - pause - repeat means that the RAM did not pass the startup integrity check. This can happen for a number of reasons: Bad RAM, incorrect speed, bad installation, gunk in the RAM sockets, broken contacts. The first step is to follow Dan's wise suggestions to check the RAM type for compatibility, clean the sockets and the RAM contacts, and reinstall.

If those steps don't solve the problem, it's possible that the RAM itself is bad. One way of checking RAM integrity is by running Apple Hardware Test, a testing utility that bypasses the system software to check the hardware underneath, including the RAM. Machines like yours, which shipped with OSX 10.7 or later, have a hidden partition on the hard drive with AHT pre-installed. If you hold down the D key as you press the Power button, and keep holding it, you should boot into AHT, which will allow you to run a RAM test. Here's Apple's description of the process:

Using Apple Hardware Test

These days, most RAM carries a lifetime warranty. If the original RAM is having problems, Apple should replace the sticks, even if the computer is out of warranty; check with your local Apple Store. If the RAM is from a third-party retailer, that retailer should replace the defective RAM.

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