After I.I've been a Mac user for years, and I've repaired hundreds of different Macs, from the early II series to the latest 20 model MacBook Pros, iMacs (and other Apple hardware to boot!), and there is almost never a hardware situation where I've thrown in the towel and told someone to ditch their Mac.If you still can't boot up your M1 Mac after all solutions above, reviving the computer will update the firmware and recovery OS to the latest version and eventually reboot your device. The mac starts up fine and goes to the login screen. Press the power button of your MacBook Pro to turn it on.It was working fine and suddenly for no reason after I last shutdown my mac I am not able to login. Then, disconnect all peripheral devices from your Mac and wait for 30 seconds to 1 minute. All you can do is press the power button for a few seconds until the computer is off. When you see that your MacBook Pro is stuck on the loading screen, you cannot shut it down from the Apple menu.Things I had seen before.So far, every time this occurs, the FileVault pre-boot window doesnt function with. Horizontal banding, some weird color issues. But then, I noticed the display would 'glitch'. First off, it was using a slow 5200 RPM hard disk after replacing that with a nice, fast SSD, and ensuring she had 8 GB of RAM in the laptop, I was pretty pleased with my work, and was about to shut down the laptop and send it on its way. Plug it back in after 5 seconds.My sister just turned over her 2011 15" MacBook Pro, which she said was running slow, and I dug in.Apple logo, then progress bar, then grey screen. Huh—usually the GPU issue would present itself during the AHT, but not this time.So I rebooted. So I ran the full (super long) test. I ran the quick test, which found no errors.
I didn't see anything obviously wrong, but knowing from past experience that problems usually surface only when the GPU/Radeon. A few records were off, but they were repaired successfully. I did an fsck -y to check the hard disk. Internet Recovery mode (hold down Option + Command + R from startup sound to Apple logo)—same thing, again.Getting nervous, I then tried single-user mode (hold down Command + S from startup sound until you see the matrix text going past as the Mac boots into its FreeBSD underpinnings)—and was happy to find at least this worked fine. Recovery mode (hold down Command + R from startup sound to Apple logo)—same thing, again. Safe mode (hold down Shift from startup sound through to login or desktop)—same thing, stuck on grey screen after Apple logo + progress bar. Attempting to drop the Radeon. Surely there's a way to bypass it!Lucky for me, I found this answer on Stack Exchange: GPU problem - Boot Hangs on Grey Screen. The only thing that seemed wrong was the Radeon GPU. Single user mode proved disk, RAM, CPU, and even integrated graphics were okay. But then I thought twice—I would look if there was any possible way to resurrect this thing.Obviously everything else was working fine—Internet Recovery proved wifi/networking was okay. I was assuming the worst.I was going to pop out the SSD and RAM, and suggest my sister sell the laptop for scrap. How Long To Wait For Login Loading After An Sierra Software Side OfBoot the MacBook Pro from said USB drive (hold option key at startup to choose it). Build a USB boot drive with Arch Linux. Better than telling my sister to junk the laptop! Hardware hack to cut off the GPU entirelyI'm not going to rehash the entire article from RealMacMods (after all, they found the process, and they also offer it as a service for $85 for anyone not willing or able to do it himself!), but I did want to highlight a few parts where I think it's important to further illustrate what needs to happen.The first part of the process involves prepping the software side of the Mac by doing the following: But then I scrolled further in that Stack Exchange answer, and noticed a link to this interesting article: MacBook 2011 Radeon GPU Disable - Real Radeongate Solution.Being somewhat handy with a soldering iron (but having never done SMD work—basically, soldering little bits and bobs that are the size of a speck of dust!), I thought I'd give it a go. But this time it would reboot itself within a minute or so, so that was different! Alas, after hacking around a bit more with System Integrity Protection disabled, the reboot cycle eventually became quite short indeed:Hitting dead ends when attempting the software fix, I was about ready to throw in the towel. Download youtube videos on mac for freeUnplug the Mac, put it on a nice, non-scratching, non-static surface, and flip it over. Shut down using the Apple Menu > Shut Down option.Again, see the source article from RealMacMods for the gory details (they even offer a $10 download to package up the fix for you—well worth it if you're not used to a command line!).Once that's done, it's time to get your hands dirty, by permanently modifying the MacBook Pro's logic board!First, to prepare the patient for surgery: Reboot into Safe Boot mode (Shift key all the way through startup). Hack your EFI by adding a file telling your Mac to disable the Radeon GPU. Hopefully you can just lift the bottom-cover-less laptop, turn it over, and you see a tiny black speck fall to you work surface.After you get the resistor off. Set down the iron / put it in it's holder, and get the resistor off the logic board. Just enough to not join the two pads together. If there are, heat the pads with the iron tip until you can 'wick away' the solder a little. Make sure there's not a solder joint between the two pads where the resistor used to be. I've just performed this mod, both the EFI mod and hardware resistor removal and I was amazed to discover it worked! I figured I've got nothing to lose and everything to gain - now my AMD chip doesn't appear in the list exactly as described, and it boots way quicker too.One thing I would say when removing the resistor - that thing is so damned small and I was worried I was going to damage nearby components by trying to get this tiny thing off.
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