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. have a pen(cil) and paper handy to record any error messages or codes.ensure that there is adequate cooling air circulation, particularly for laptops, which should be operated on a firm, flat surface.if a laptop, connect to the mains power supply, and check that the power is turned on.ensure that your mouse and keyboard are connected by wired USB rechargeable Apple wireless models should be connected to a USB port using their charging lead, which effectively makes them USB rather than Bluetooth.disconnect all peripherals except the keyboard, mouse, any external display, and any Ethernet network cable.if you have a firmware password enabled, turn it off before trying to start up in diagnostic mode, or that won’t work.To run Diagnostics or AHT properly and generate the most reliable result, prepare your Mac first: Very old Macs may still require you to restart from one of their original install disks which contains their equivalent. Although they may not be as thorough in some respects as third-party alternatives, they’re the benchmark sets of hardware diagnostics. If you suspect that your Mac may have a hardware problem, or need to rule one out, the first step to take is to run Apple Diagnostics or, on Mac models released before June 2013, Apple Hardware Test (AHT).
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