- 1). 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.
- 2). Restart the computer.
- 3). Press and hold the "D" key immediately after the startup chime. Release the key after the Mac begins to boot from the disc.
- 4). Click the "Next" button.
- 5). 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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