Situatie
You can use the Apple Hardware Test (AHT) to diagnose issues you’re having with your Mac’s hardware. This can include problems with your Mac’s display, graphics, processor, memory, and storage. You can use Apple’s Hardware Test to rule out most hardware failures as the culprit when you’re trying to troubleshoot problems you’re experiencing with your Mac.
Solutie
Pasi de urmat
From the Apple menu, select About This Mac
In the window that opens, click the More Info button
If you’re running OS X Lion or later, click the System Report button; otherwise, continue with the next step.
In the window that opens, make sure Hardware is highlighted in the left-hand pane.
From the right-hand pane, make a note of the boot ROM Version number, as well as the SMC version number (if present).
With the version numbers in hand, go to the Apple EFI and SMC Firmware update website and compare your version against the latest available. If your Mac has an older version, you can download the latest version using the links on the above webpage.
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