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Helpful answers
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Oct 9, 2015 12:13 PM in response to lars ulrikby Loner T,If this is not too late, can you check Device Manager for any unknown devices (yellow triangle with exclamation mark)?
Run Resetting the System Management Controller (SMC) on your Mac - Apple Support and How to Reset NVRAM on your Mac - Apple Support and check fi the Alt/Option key will let you choose OSX. If the W10 upgrade overwrote any other partitions, you may need toHow to install OS X on an external drive connected to your Mac - Apple Support and boot from this external OSX disk to diagnose your partitioning issues.
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Oct 11, 2015 11:02 AM in response to Loner Tby lars ulrik,Ok. So SMC and NVRAM, if still no OSX then OSX on external drive? Thank you so much! Will test this out and come back to you!
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Oct 11, 2015 11:12 AM in response to lars ulrikby Loner T,Can you download GPT Fdisk from http://sourceforge.net/projects/gptfdisk/ and unpack it on the Windows side? Let us check if you have OS X or not.
Can run the following in an Admin CMD window? Please notice the drive number is "0:" without the double quotes.
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Oct 11, 2015 11:27 AM in response to lars ulrikby Loner T,In the CMD window with Admin rights (you should be in the directory where the executables are located).
1. Type gdisk64.exe 0:
2. Type p
3. Type q
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Oct 11, 2015 11:32 AM in response to Loner Tby lars ulrik,C:\Windows\system32>gdisk64.exe 0:
'gdisk64.exe' is not recognized as an internal or external command,
operable program or batch file.
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Oct 11, 2015 12:11 PM in response to lars ulrikby lars ulrik,DISKPART> list disk
Disk ### Status Size Free Dyn Gpt
-------- ------------- ------- ------- --- ---
Disk 0 Online 931 GB 0 B *
Disk 1 No Media 0 B 0 B
Disk 2 Online 7460 MB 0 B
When installing Windows i believe i removed the mac drive, is it possible to undo that and install OSX the same way as i installed windows and then start over with bootcamp to get windows 10 again? Just doing it correctly this time...
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Oct 11, 2015 2:04 PM in response to lars ulrikby Loner T,lars ulrik wrote:
C:\Windows\system32>gdisk64.exe 0:
'gdisk64.exe' is not recognized as an internal or external command,
operable program or batch file.
You will need to go to the directory where the program is located. In my case it was in Downloads.
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Oct 11, 2015 2:05 PM in response to lars ulrikby Loner T,lars ulrik wrote:
When installing Windows i believe i removed the mac drive, is it possible to undo that and install OSX the same way as i installed windows and then start over with bootcamp to get windows 10 again? Just doing it correctly this time...
GPT Fdisk will provide much richer information. It may also be possible to fix it from the Windows side.
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Oct 11, 2015 5:44 PM in response to Loner Tby lars ulrik,Ok, now i got this!
C:\Users\Ulrik\Downloads\gdisk-windows-1.0.0>gdisk64.exe 0:
GPT fdisk (gdisk) version 1.0.0
Problem opening \\.\physicaldrive0 for reading!
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Oct 11, 2015 6:42 PM in response to lars ulrikby Loner T,1. Do you have a second Mac?
2. Can you install OS X on an external disk, if the answer to 1 is no?
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