![]() If the recovery partition isn’t present and valid, these instructions won’t work.Ĭlick the 2nd entry, you should see (and then click): If the 2nd partition isn’t the recovery partition, look under the paths in the list to see if one of them is it. The second PCI path is probably to the recovery partition, the one you need to boot from. The first PCI path in the list is probably the boot partition that doesn’t contain bootable firmware. ![]() You should see two entries in a list (they are cryptic looking PCI bus paths). Select Boot Maintenance Manager and click. You’ll be brought into an EFI text-mode GUI. It will reset the SMC which is another useful troubleshooting function.I was able to fix the UEFI problems as follows ( credit to techrechard website): Key: Left Shift (⇧) + Control (⌃) + Option + Power (⎋)ĭescription: Press and hold these keys until your Mac turns on. This can be useful to try if your Mac starts playing up or behaving strangely (like the bluetooth suddenly stops working). Useful if one of them is causing issues and not letting you boot.ĭescription: When you have set an account to automatically login to your Mac on each boot, this command will over-ride that and allow you to select an account to login with.ĭescription: Press and hold all these buttons as soon as your Mac turns on to reset the PRAM/NVRAM. Key: Hold down Shift (⇧) after clicking login on the login screenĭescription: This will prevent all login and startup items from loading. as if it wasn't actually inserted).ĭescription: If your Mac has somehow been set to boot from a non-Mac volume (like Windows) this will force it to boot from a Mac volume. Key: Media Eject (⏏), F12, mouse button or trackpad buttonĭescription: If some removable media is inserted into your Mac, this option will boot it with that media being ejected (i.e. It can be very helpful for troubleshooting.ĭescription: If you are having major issues with your Mac, this will load a menu that let's you run the Disk Utility and also completely reinstall macOS if you need to.ĭescription: In contrast to loading the Recovery OS, which will install whatever version of macOS you were running at the time, "Internet Recovery OS" allows you to download and install the macOS version that you device shipped with from the factory.ĭescription: Your Mac will carry out various hardware tests in order to try and identify a problem with its hardware, should there be one.ĭescription: If your hard-drive is so damaged that you can't actually run a proper hardware test as above, you can use this command to try and run one remotely, via the internet.ĭescription: If there are other disks on your network that you want your Mac to boot from, you can select them here.ĭescription: As above, this will attempt to boot your Mac from other disks on your network, but the default image will be used (you don't get to choose). ![]() ![]() Very useful for copying files!ĭescription: Instead of just seeing the loading progress bar and everything happening in the background, you'll see the text output of exactly what is being loaded/going on as your Mac boots.ĭescription: This mode disables all start up items and loads a minimum number of services and daemons. It can be useful for troubleshooting for advance users.ĭescription: Instead of loading macOS, your Mac will behave as if it's a USB-C or Thunderbolt external storage device. You only have a basic text console with which to execute commands. Boot from NetBoot Server Using Default Imageĭescription: If your Mac hangs or freezes, you can do a manual restart or power down by pressing holding the power button.ĭescription: Instead of booting from your hard-drive like normal, your Mac will boot from your CD/DVD player.ĭescription: This allows you to select which disk you want your Mac to boot from.ĭescription: On Macs, Single-User mode loads a very basic UNIX environment.
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