#Mac os x boot camp problems mac os x#
#Mac os x boot camp problems install#
#Mac os x boot camp problems update#
#Mac os x boot camp problems windows 10#

#Mac os x boot camp problems update#

My suspicion, though, is that the Windows update may have removed the GPT data from the disk, which might require tools other than GPT fdisk to fix. You may want to read the GPT fdisk documentation on repairing GPT disks for basic disk-repair information. You can check your computer model by selecting the Apple menu and choosing About This Mac when you are booted into OS X.

#Mac os x boot camp problems windows 10#

You will find additional details on the Mac models that support Windows 10 on the following link.

#Mac os x boot camp problems install#

Add four spaces before each line to preserve formatting (or post it as a cropped screen shot of your Command Prompt window). Open Apple Software Update for Windows and install available updates to get all the drivers. Edit your original post to include all of the gdisk output.Type p to view your partition table, type v to do a disk verification, and then type q to quit without saving your changes.Run gdisk on the disk (use an Administrator Command Prompt window in Windows), as in gdisk.exe 0: in Windows or gdisk /dev/sda in Linux.Tools like Disk Utility or the Windows partitioning tools are much less useful for this type of work. I'm recommending gdisk both because I'm very familiar with it (since I wrote it) and because it offers a good set of diagnostic and recovery tools for low-level GPT problems. Alternatively, you could use a Linux emergency disk that includes gdisk, such as Parted Magic. Download and install the Windows version of GPT fdisk ( gdisk).That said, you can begin getting some diagnostics on your partition table as follows: This may take a lot of back-and-forth, so this forum may not be the best place to get it resolved you may want to try a Mac forum like MacRumors. If so, you'll need to fix it, but to do that, you'll need extra diagnostic information. In my particular case, the OS-X partition was still bootable if I held the Option key during startup and selected the 'Macintosh HD'.Īfter booting OS-X you'll want to open System Preferences, and then go to Startup Disk.It's possible that the Windows update has messed with your partition table. Please read other forum descriptions before posting here.

#Mac os x boot camp problems mac os x#

Because of the confusion, and the fact that the boot loader is installed to a different place depending on which mod you are booted in, the grub updater makes a big mistake and installs grub in MBR mode to the internal HDD. Mac OS X System & Mac Software All questions and problems related to running OS X should be posted here as well as those for miscellaneous software not more specifically covered in other forums. Now at this point I don't know exactly what happened, but here's my best guess: The grub updater got confused since grub was installed in MBR mode, but Ubuntu was currently booted in UEFI mode. Looking at logs, it seems that the update-grub command was run during the install process. So then I let the Software Updater run some updates. That fact is very important, and you'll see why in just a second. What that means is because rEFInd is, well, EFI obviously, and it functions essentially as a GRUB replacement, that even though Ubuntu was installed in MBR mode to the external HDD, it ended up being booted in UEFI mode. Instead, it was the scrolling white text boot up.įrom what I can tell looking at rEFInd more closely before hitting boot is that the Ubuntu option was actually to load a specific kernel, and not just boot from the disk. After telling rEFInd to boot from the external HDD, the purple GRUB screen never came up (Yes, I had set a delay) and furthermore, there was no purple dot boot animation. This is where things start to go really strange. After booting from that DVD, I then selected my external HDD to boot from inside of rEFInd. (Selecting 'EFI boot' with the DVD icon when holding the Option key during startup). Now in order to boot Ubuntu from my external HDD, I first booted from a DVD that I had burned an ISO of rEFInd to. That value is controlled by your selection in 'System Preferences > Startup Disk'. Apparently, there is an NVRAM value that tells the firmware whether to attempt to boot in UEFI mode (OS-X) or in legacy MBR mode (Windows).

In order to maintain compatibility with MS-Windows, Apple uses a hybrid UEFI and Legacy MBR mode. So things were even more complicated than it seemed at first.