![]() Make a note of the error before you call Apple Support for a replacement. If Apple Hardware Test detects a problem, it displays an error. Insert the system software disc or USB flash drive.Do not try to use a disc or USB flash drive from another Mac model. Important: Follow these instructions only if your Mac came with a system software disc or USB flash drive. If your Mac came with a system software disc or USB flash drive, you may be able to use it to start Apple Hardware Test. If you updated your Mac to OS X 10.8.4 or later, use the system software disc or USB flash drive that came with your Mac When the Apple Hardware Test main screen appears (after about 45 seconds), follow the onscreen instructions.When the Apple Hardware Test chooser screen appears, select the language you want to use, then press the Return key or click the right arrow button.Reconnect your Mac to the network, then restart your Mac while holding down both the Option and D keys. You may be able to start Apple Hardware Test from the Internet. If you don’t, Apple Hardware Test may not be available on your Mac. After your Mac restarts, you should see the Apple Hardware Test chooser screen.If your Mac has OS X 10.8.3 or earlier, use Apple Hardware Test (built into your Mac) If Apple Diagnostics reports that your Wi-Fi card is not working properly, contact Apple Support or take your Mac to an Apple Store or Apple service provider.To start your Mac from the built-in recovery disk and open the “Contact Apple Support” webpage in Safari, click “Get started.” (The reference code is for use by Apple Support.) When Apple Diagnostics is finished, it lists any problems it finds. After your Mac restarts, Apple Diagnostics starts automatically.Restart your Mac, holding down the D key while the Mac restarts.If you have an Ethernet cable or external DVD drive, disconnect it. Disconnect all external devices except the keyboard, mouse, display, and speakers. ![]() There are three different ways to initiate a hardware diagnostic test, depending on the age and type of the hardware you have: If you have a new Mac (mid-2013 or later), use Apple Diagnostics (built into your Mac) As you can imagine, the long test is more thorough. ![]() There are two types of diagnostic tests you can choose to run : a short test (which takes about 5 - 10 minutes to run) and a long test (which can take an hour or longer in some cases, depending on your hardware configuration). This diagnostic utility checks everything from memory to the video card to the system board and much more. These can be tricky to identify.Įvery Mac comes with a hardware diagnostic tool to help identify possible hardware failure. ![]() The tougher challenge is when a less catastrophic problem arises. At least those problems are easy to identify and resolve. When these failures occur, it could result in catastrophic failure. Neither are 100% immune to hardware failure or issues. In some cases, the hardware used in a high-end MacBook Pro is the same component used in a mid-range HP EliteBook. Those components are then shipped to manufacturers like Foxconn in China to assemble. The fact is, Apple sources a lot of their internal components from companies like Intel, NVidia, and many others. ![]() As much as I would like to say that Apple's hardware is flawless, that simply isn't true. ![]()
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