![]() ![]() (If you don’t have an ‘any’ key, just press Return) -) first is a letter ‘oh’ the second is a number ‘zero’) Type in O780-A15.exe and press Return (NB.Select FreeDOS Safe Mode and press Return.Select Default and press Return OR wait for it to time out.Start the Optiplex 780 SFF and press F12 when Dell logo appears.Copy O780-A15.exe to the USB stick (at the top level, not in a folder).Enter your login password, when prompted.If it fails the first time, click Done and do step 4.Erase and format the USB stick for MS-DOS.Insert a spare USB stick in a USB port (IT WILL BE ERASED).Download and install unetbootin from here.Updating the BIOS (only do this if it is less than version A15) Scroll through each of the BIOS settings pages and take a photo for future reference. ![]() Restart the 780 and when Dell logo appears keep pressing F2 until you hear a beep.Record BIOS settings (in case you break something later on) If the number is less than 15, you need to update the BIOS.Look at the very bottom of the screen for, “BIOS Revision AXX”, where XX is a number.Restart the 780 and watch the boot screen. ![]() Another USB stick of about 2GB or more.A camera/phone for taking photos of settings.A computer with access to the Internet (preferably NOT the Optiplex in case you need to download something halfway through).Clover Configurator (Vibrant Edition) from.A Radeon HD5450 Graphics Card (the on-board card is not supposed to work, although it did for me).A Dell Optiplex 780 SFF (I did say it’s an idiot’s guide).If you have a recovery partition, to boot directly into the Recovery Mode, turn on the Mac and immediately press and hold ⌘ + R.An Idiot’s (My!) Guide to Installing Mac OS X Sierra 10.12.3 on a Dell Optiplex 780 Small Form Factor The ambiguity of that last statement is I did that awhile before writing this comment, and I don't recall what I booted into first, only that it worked and was not hard to figure out what to do at that point. Installation will continue, or you will boot into the OS or get the Recovery Utilities menu (where macOS can be reinstalled from or Disk Utilities run). If the recovery partition isn't present and valid, these instructions won't work.Ĭlick the second entry. If the second 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. I was able to fix the UEFI problems as follows (credit to the VirtualBox forum): After manually directing EFI to boot into macOS for the first time, macOS automatically fixed up the boot partition, and subsequent boots worked properly. ![]() In my case, after installing macOS into a virtual machine according to these instructions (running the macOS installer from an ISO image downloaded from Apple), on first boot, the boot partition was present, but unconfigured (probably no boot image installed). By now you may have surmised boot.efi is an EFI standard filename that lives at an EFI standard path in a disk partition, and it contains OS-specific boot firmware (e.g., Windows, Linux, etc. Ultimately, the objective is provide a boot partition that contains a macOS boot.efi. Your immediate objective is to help EFI locate and execute OS-specific boot firmware. However, assuming you have a macOS recovery partition on that disk, it should contain a copy of boot.efi (macOS-specific boot firmware) that you can boot into the OS with. UEFI requires intervention, because the EFI firmware on the Mac's motherboard can’t find valid OS-specific EFI boot firmware in the standard location on disk. ![]()
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