The Retina monitor 'blinks' but not signal is detected on external displays. After the upgrade, my Mac is not recognizing any external display: I've tried HDMI and DisplayPort to VGA adapters. I've just upgraded to macOS Sierra on my MacBook Pro Retina Mid 2012.To do so: Boot OS X into Recovery mode by first, restarting your Mac.Same result when I try to run AHT from a USB stick, except this time it shows the above message twice – flashing by so quickly I had to get a video of it to see what it said – then immediately restarts into MacOS.GMs modern full-sized pickups are the Chevy Silverado and the GMC Sierra. It is the System Integrity Protection, and it first needs to be disabled for Recoverit Video Recovery software to recover videos from your drive. It also comes with an automatic Pilot mode that allows you to simply press a button.For Mac OS X High Sierra, the process above might have issues due to restrictions where the built-in system drive cant be accessed. Which sits there for about five minutes, then it restarts into MacOS.Cocktail is a general purpose utility for macOS that lets you clean.
I provided links to the two Apple Community threads and emphasized that there are over 150 people now waiting for an answer. See my posts here and here for more detail and follow-ups.I spent an hour and a half on the phone with an Apple Senior Advisor on Tuesday (May 28) about this issue, trying everything he could think of (he apparently hadn't heard about this before), ending with sending a bunch of information, which he said would be forwarded to some "engineers", who would get back to me in a few days. So we're all waiting for Apple to get off their collective posterior and fix it.There's a ton of people encountering this Unable to launch Apple Diagnostics Apple altered the EFI so all versions of MacOS are effected from Sierra on up is where I've seen it.Yes, I also posted my query at Apple Discussions: MacBook Pro 2013 - cannot load Apple Hardware Test, and was referred to the Unable to launch Apple Diagnostics thread (which now has 163 "I have this problem too" clicks, while mine has 5). It is beyond ironic that the software Apple offers to its users to diagnose problems with their Apple hardware… doesn't work. So after OS reinstall of High Siera 10.13.6 - my MAC started to breath.Yes! This is an issue with in Apples newer MacOS EFI/SMC updates.When I posted the above, I thought it was a problem with my MacBook Pro I've since learned that it's a common problem afflicting hundreds (at least) of Mac users. It was long, but without surprises. I'd been experiencing with this Early 2013 15" MacBook Pro finally became intolerable. You could try calling them most likely they'll send you to a authorized service center if there's one near you.Oh, yeah, about that… All this started for me in early 2018, when the intermittent crashes etc. Anyway, AHT doesn't "repair" anything it's a simple diagnostic utility – and it won't load/run in any of the Macs that Cannot load 'EFI/Drivers/TestSupport.efi'.Apple holds the cards for their diagnostic software. See my second post in Unable to launch Apple Diagnostics for more detail about AHT/AD. Mac usb software for zte phoneSo I bit the bullet and did some research, learned that both Apple Hardware Test and Apple's pre-2015 in-house diagnostic software Apple Service Diagnostic could be found on the 'Net. (The new 2015 MBP turned out to have problems also, and I ended up struggling with both – along with my long-term chronic illness – all year, until finally early this year I got together enough energy to try to deal with them.)But my MacBook Pro wasn't fine. Presumably they ran Apple's in-house diagnostic utility/ies.(The guy said something about the "EFI version" I didn't know what that meant at the time.) They told me the 2013 MBP was fine. I then took the 2013 MBP to the local AASP, asked them to diagnose it, for which they charged me $60. Diag Mode For Sierra How To Perform AIf I find out anything new I will let you know, I would like if you had any ideas on how to perform a SMC with a nonfunctioning power button. It may be that Apple downloaded a firmware or security update and messed up the drivers. Well one thing is for sure, the SSD plays no role in whether it would update or not. Without the use of Hardware Diagnostics and not being able to perform a SMC because of the power button I’m in a real jam.
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