We can power off the computer by holding the power button and then power up while holding option key. The wait time is too short, if you have many devices connected it will not load correctly. Don't panic, this is because there is a bug in Apple's Boot Camp loading system. Then the computer should restart, and very likely to stuck in black screen. Apple has a very specific design for the hybrid EFI-MBR system for iMac's fusion drive. Disk Utility or other type of applications will not work. We must use it because Boot Camp is the only application that can create usable disk space for the installation. Now we can finally use Boot Camp Assistant to install Windows. I suggest not to check install just yet, in case you need to manually place the file. If downloading failed for some reason, we can download the files here:Īnd then manually place the files to the installation disk. And we must check downloading from Apple, because it will give you drivers you need to complete the installation. Then we will create an installation stick with Boot Camp Assistant. But to be safe, we should USE FLASH DRIVE. It might have something to do with the type of adapter I have. I tried using SD card adapter, it failed too. So what we need is an old fashion flash drive. It will load the install program, but after loading it becomes all Windows, and then it will fail the installation. This won't work because SD card is too advance for what we are doing. Many people including me failed because we try to use SD card. The first thing to do is to find a USB flash drive. In short, EFI would not work with the hardware, so we must go through Apple's Boot Camp. As a result, Apple has an interesting way to manage it. Since late 2012, iMac have fusion drive, which means its hard-drive is combined with SSD and traditional hard-drive. On iMac, here is how you can get Windows 8.1 (Professional) to install. But again, I haven't tried for very long. So far I haven't gotten Mac Pro to work, because it has the most particular type of hard-drive, perhaps Windows simply does not support. IMac (2014) and Mac Pro (2014) have different types of hard-drive. ClaitonLovatoJr's solution works on Macbook Pro Retina but not iMac or Mac Pro. For example, I have Macbook Pro Retina, iMac, and Mac Pro. As it turns out, not all OSX are the same. After 10 hours, I finally have resolved this. I was stuck with this challenge last night as well. (Not EFI) This time when you see the partitions it will be select-able as the installation disk.ĭuring installation Windows rebooted 2 times and I use Alt-Option button just to be sure that proper disk was booted. At this point reboot with the Alt-Option button and select the Windows DVD. Then I go to Disk Utility and manually divide Mac OS partition in two parts to add space (not formatted) for windows installation.Īfter that, when I rebooted with Alt-Option button, I was able to choose EFI Boot option on inserted DVD disk and successfully install Windows by create appropriate partition on space that I prepare with Disk Utility. I removed Bootcamp partition with Bootcamp utility - this reverts partition table to GUID. Now when Win 8 installer have EFI boot mode, we actually don't need Bootcamp utility at all. Bootcamp utility creates hybrid-MBR table and this prevents Windows 8 to be installed. I also was looking for solution to this issue and find it by understand the roots of problem. Also quick format works too - will save you 2 hours on a 1TB disk. I managed to make it work by buying a USB SuperDrive and booting from the Windows disk (not EFI). This solution doesn't seem to work when booting from the bootcamp created USB. Press refresh and you should be able to select the partition.Select partition 4 (assuming 4 is your bootcamp partition)įormat fs=NTFS label="Windows 8" (I didn’t use QUICK) Select disk 0 (assuming 0 is the disk where you created the bootcamp partition) Press Shift+ F10 to open a command prompt window.Start the install and go to the partition selection screen.I formatted it on NTFS and after that it allowed me to select the partition and installed successfully there. What fixed this for me was to format the partition using diskpart, opened a command prompt on the "select partition screen" and formatted the partition. I was having a similar problem, the first time I got the same MBR error, rebooted and started getting a generic error to check the install logs.
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