Experimax Open For Business – Policy & Procedures to Covid19

How to Know if Your Apple Computer RAM is Faulty

How to Know if Your Apple Computer RAM is Faulty - Diagnose Faulty RAM

Experimac Naperville is a computer, l and iPhone repair specialist that can solve even the highest technical problems, most within one day.  Experimac will provide a series of how-to articles to help you understand that even the most difficult problems can be corrected.

This article is going to be directed towards MacBook Pro Unibody laptops from Late-2008 to Mid-2012. A common problem with MacBook Pro Unibody laptops (MBP for short) is, faulty or improperly seated Random Access Memory (RAM for short). RAM is volatile memory used to temporarily store and access data quickly because it is much more efficient than getting that same data off the hard drive. Literally every program and application, including the operating system, uses RAM. Some programs use more RAM than others, but, again, all programs use it. There are a few different ways to determine if your RAM is faulty or needs to be reseated. We will go over our most common ways of determining this below with different scenarios.

Scenario 1:

If you believe your MBP has random application crashes, random pauses, data corruption or is just running slower than it used to, you may want to check your RAM. For this scenario, you need to know how much RAM your MBP is supposed to have. For example, 4GB, 8GB or 16GB. Once you’ve determined how much RAM your MBP came with, follow these steps:

  1. Boot your MBP and login so that you’re on your desktop.
  2. Navigate to the small Apple logo in the top left corner and click once.


  1. Click “About This Mac”. At this point you can determine how much RAM is being recognized by your MBP by reading the line that starts with “Memory”.

If your MBP is supposed to have 4GB of RAM and “About This Mac” states that you have 4GB of RAM, your MBP is perfectly fine as far as RAM goes and you can stop here. If your “About This Mac” is stating you only have 2GB of RAM when you’re supposed to have 4GB of RAM, continue to step 4.


  1. Click the button labeled “System Report…”






  1. Once the system report window opens, navigate to and click “Memory” in the left-hand pane.
  1. Your system should show either BANK 0/DIMM0 or BANK 1/DIMM0 as empty, or it should have some other error message.
  1. At this point, we can determine that the RAM in BANK 0/DIMM0 either needs to be reseated or replaced. If you know how to reseat and/or replace RAM, we would suggest doing so now. If you do not know how to reseat or replace RAM, we highly suggest visiting one of our professionals at Experimac of Naperville to avoid further damage to your MacBook Pro.


Scenario 2:

Another scenario you may face is one tone repeating every 5 seconds, which means no RAM is installed, or 3 successive tones repeating every 5 seconds which means your RAM did not pass a data integrity check.


The solution for this scenario is reseating the RAM in your MBP, and if that does not work, replacing the RAM in your MBP. After you reseat and/or replace the RAM, follow the steps listed in Scenario 1 to ensure your RAM is being read correctly. If you can’t get far enough to follow the steps in Scenario 1, we highly suggest visiting one of our professionals at Experimac of Naperville to avoid any other potential damage.  


You can call 630.857.9984 or visit Experimac Naperville at 1523 North Aurora Road, and we will receive honest, trustworthy advice on what you really need to solve your problem.