Provided that you haven’t reset the NVRAM, the same information can be retrieved from your Mac’s NVRAM using the Terminal command Once your Mac has restarted, you can display the results of the last test run in System Information: open About This Mac, click on the System Report… button, and select the Diagnostics item in the Hardware section. ![]() Apple’s account of this procedure is here for Macs released before June 2013, and here for newer Macs. Make a note of that, prepare your Mac for restarting, then click on the Restart button at the bottom of the window. Shortly after that, a progress bar will appear and the diagnostics will run to completion.Īt the end of those, you’ll be given the result code, which should be ADP000 if all tests were passed OK. ![]() Then release that key and select the appropriate language. Once you’ve done all those, shut your Mac down, leave it ten seconds or so, then start it up holding the D key down until you see a list of different languages.
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