You can easily check the RAM using your Mac's built-in tests.
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Restart or boot up your Mac and hold D while it boots; this will take you to the diagnostics screen. The Diagnostics section varies depending on the age of your Mac and OS: on older systems where the diagnostics page has a blue background you'll need to select the middle tab, Hardware Tests, then put a tick next to 'Perform extended testing takes considerably more time ' and hit the big blue Test button.
If your system is more recent, you may find that the memory test begins automatically; the newer interface has a grey or black background.
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You may find, additionally, that the diagnostic function has been removed from your system; this sometimes happens when you format the hard drive and reinstall OS X. For further confirmation, you can turn to third-party RAM checkers. We recommend that you try more than one and compare their results, because one program may miss a problem that another can detect.
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One of the most popular memory-testing utilities is memtest , which is free and runs from the Terminal command-line. Remember to check the reviews to find something reputable. Read next: How to find the best apps on the Mac App Store. We recommend that you run the RAM checks in as stripped-down an environment as possible: you want to make as much RAM available for testing as possible. If repeated tests indicate that something is wrong with your Mac's RAM, it's time to do something about the problem.
On certain models of Mac but not many, these days , you'll be able to access the RAM modules: if so, and if you're up for the slight effort and minor risks involved in doing so, you can buy some new RAM and pop it in yourself. If you're not keen on tech DIY or if your Mac doesn't allow such tomfoolery, you need to get someone else to fix it.
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Apple Diagnostics reference codes are explained in the last section. If you Mac is connected to the Internet via Ethernet or Wi-Fi and an issue has been detected, you will be offered to get support articles from Apple.
Use Apple Hardware Test and other diagnostics to test for hardware
Doing so will reboot your Mac in OS X Recovery Mode which will let you access your support and service options through Safari and see additional troubleshooting steps and information to help resolve your issue. You can use the following keyboard shortcuts to enter Apple Diagnostics or Apple Hardware Test and select its features.
If Apple Diagnostics or Apple Hardware Test isolate a hardware issue with your computer, you will get an error code. You will need this code to learn more about what might be wrong with your computer and how to troubleshoot the issue. In addition, these codes are required if you contact Apple or take your Mac to an Apple Authorized Service Provider or Apple Retail Store to determine which service and support options are available.
Apple Diagnostics or Apple Hardware Test mode?
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