How to Test Your RAM on a Mac
Random Access Memory, or RAM, is the memory that the computer operates from. RAM is considered "volatile" and requires the computer to be powered on for it to work -- as soon as you power off your computer, all contents of the memory are erased. You can test the RAM on an Apple Macintosh computer by booting into the Apple Hardware Test program provided with the Mac.
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Instructions
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Insert the disc containing the Apple Hardware Test suite into the disc drive. This is normally the second Mac OS X install DVD provided with the computer.
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Restart the computer.
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Press and hold the "D" key immediately after the startup chime. Release the key after the Mac begins to boot from the disc.
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Click the "Next" button.
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Press the "T" key to perform a series of basic tests on the Mac, including the RAM. The results are displayed when finished.
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