The extended test is a good option if you suspect an issue with the RAM or video/graphics. The Apple Hardware Test supports two types of testing: a standard test and an extended test.If the configuration information appears to be correct, you can proceed to the testing.If the configuration information doesn't match up, you may have a failed device. You can do this by checking the Apple support site for the specifications on the Mac you are using. If anything appears to be wrong, verify what your Mac's configuration should be. Verify that the correct amount of memory is reported, along with the correct CPU and graphics. It's a good idea to take a cursory look at this, just to make sure that all of your Mac's major components show up correctly. Before you press the Test button, you can check what hardware the test found by clicking the Hardware Profile tab. Once it's complete, the Test button is highlighted. This process can take a little bit of time.
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