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The keyboard light that was blinking helped. Searching for reason where that would happen said there was not enough power to the keyboard. The (non-Apple) keyboard was going through a KVM switch (which actually is powered). So I figured there is something it doesn't like about the keyboard. After directly connecting an Apple keyboard to the Mac Mini I was ...


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rEFInd will not let you set an arbitrary NVRAM variable directly but you can use EDK2 to compile a small EFI driver. This is described in the WikiLeaks document EFI Basics: NVRAM Variables EFI drivers placed in rEFInd driver directory are loaded and run automatically - see The rEFInd Boot Manager: Using EFI Drivers. Alternatively you could write a EFI ...


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With Ubuntu, GRUB files are stored in the EFI/BOOT and EFI/ubuntu folders in the hidden EFI partition. Apply the following steps to remove the GRUB files. Enter the following command to determine the identifier for the hidden EFI partition on the external drive. diskutil list For this example, I will assume the identifier is disk2s1. In the following steps,...


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Yes. We did this all the time back in the day and it was very fussy. The problem wasn’t so much the process of restoring and blessing as much as the issue is firmware drivers and differences in chipsets on Macs as well as controllers in the USB and FireWire external drives. This all interacted in ways that made booting even more fussy than if the drive ...


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When you have power issues, the most likely cause is hardware. Follow precisely the steps to reset your SMC https://support.apple.com/en-us/HT201295 This is something you want to do once, not regularly reset it - more than three resets in a month = a trip to repair for us at work. Your machine has a T2 chip, so that also controls power on, so in rare cases ...


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I would seem to me that you are missing the obvious. If the Boot Camp Assistant configured your Mac to install Windows 10 to BIOS boot, then you should have not tried so hard to defeat this. Install Windows 10 to BIOS boot and if this works, then accept that your model is one of the last built before Apple converted over to UEFI booting Windows 10. From my ...


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It might be easier to boot in target disk mode to erase a machine that’s not healthy enough to boot to recovery. As you know, you’ll need to assemble an external OS and modify it to prevent graphics drivers to get around your failed GPU / logic board. Target disk mode often works in this case since only the firmware is running - no OS. Both of these require ...


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Note: These instructions are for version 0.12.0 of rEFInd. If you download a different version, then make the appropriate substitutions for the version you are using. The rEFInd Boot Manager: Getting rEFInd webpage has a link for A USB flash drive image file. The default is for the downloaded files to be placed in the folder ~/Downloads/refind-flashdrive-0....


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One primary purpose of the "nextonly" option is to allow for installation of a startup manager. For example, if you install rEFInd as a boot manager, then you would configure the Mac to always boot to rEFInd. This boot manager can be configured to display different operating system to boot. After a selection is made, rEFInd instructs the firmware ...


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