I decided to test it by installing Mojave on the 2014 MBP (which I've just gotten, so I don't know if it's been upgraded before it arrived with Sierra). So the theory that installing those OS versions might cause this problem seemed plausible. I'm pretty sure I did install both High Sierra and Mojave on the 2013 MBP sometime after the last time AHT ran successfully – and before it wouldn't. So it seems this MBP is now somehow allergic to Apple's own EFI driver? I've reset the SMC and NVRAM, and reinstalled the OS (Sierra, and others) numerous times, to no avail. Meanwhile, MemTest86, which also starts up from an EFI driver from a USB stick, still works fine with this MBP. The 2013 MBP loaded AHT fine only a few months ago, but now does not. The 20 MBPs load Apple Diagnostics on order with the D key. diagnostics folder is installed in System/Library/CoreServices. The 2013 won't load Apple Hardware Test from either the Internet, a USB stick, or when the (invisible). At the moment I have 3 15" MacBooks Pro on hand: (Early) 2013, 2014, 2015. I have this problem also see my post MacBook Pro 2013 - cannot load Apple Hardware Test.Ģ.
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