Can't use mac os.

Question

Level 1

8 points

Can't use mac os.

Whenever I turn on my mac I click on windows and I can use the windows os just fine, but when I try to use the mac os my computer just shuts down. How can I fix this?

MacBook Pro

Posted on May 14, 2016 12:07 AM

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Answer 1

judysings

Community Specialist

May 15, 2016 7:31 AM in response to KF207

Hi KF207,

I understand you are not able to start your Mac in OS X after installing Windows with Bootcamp. The resource below will provide some troubleshooting steps for this issue:

How to choose a startup disk on your Mac

Use these steps to choose a startup disk with Startup Manager:

Turn on or restart your Mac.

Immediately press and hold the Option key. After a few seconds, the Startup Manager appears. If you don't see the volume you want to use, wait a few moments for Startup Manager to finish scanning connected drives.

Use your mouse or trackpad, or left and right arrow keys to select the volume you want to use.

Double-click or press the Return key to start up your Mac from the volume you selected.

Restart in OS X from Boot Camp

If you have started up your Mac in Windows using Boot Camp, you can use the Boot Camp system tray to switch your startup disk default back to OS X.

In Windows, click the Boot Camp icon in the system tray.

From the menu that appears, choose Restart in OS X.

Start from OS X Recovery

You can also start your Mac from OS X Recovery or Internet Recovery if your Mac was manufactured after 2011.

To start your Mac from the Recovery System, use these steps:

Start up or restart your computer.

Hold down the Command and R keys on your keyboard until you see the Apple logo appear onscreen.

Take care,

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Answer 2

Loner T

Level 9

59,536 points

May 15, 2016 7:56 AM in response to KF207

Was OS X working properly before you installed Windows? Is this a new Windows installation?

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Answer 3

KF207 Author

Level 1

8 points

May 17, 2016 5:48 PM in response to judysings

I was able to enter recovery mode, but for some reason I wasn't able to reinstall the os, and when I tried to repair the disk, it couldn't be repaired.

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Answer 4

Loner T

Level 9

59,536 points

May 17, 2016 6:06 PM in response to KF207

What year/model is your Mac?

During the installation of Windows, your disk was converted from a GPT to an MBR disk, which will disallow OS X to boot, because it needs EFI. To inspect your internal disk, How to install OS X on an external drive connected to your Mac - Apple Support and boot from it.

Be aware that you may be installing the shipped version of OS X rather than the current version. If it is older than the current version on your internal disk, it can cause further problems.

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Answer 5

KF207 Author

Level 1

8 points

May 17, 2016 7:49 PM in response to Loner T

It's a 2013 Pro. The Mac OS was working fine before I installed windows and for a few months after I installed it. It just stopped working all of a sudden.

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Answer 6

Loner T

Level 9

59,536 points

May 17, 2016 8:26 PM in response to KF207

If you boot into internet recovery, from Utilities -> Terminal, run the following two commands, copy the output, quit Terminal, start Safari, paste the output on this discussion.

diskutil list

diskutil cs list

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Answer 7

KF207 Author

Level 1

8 points

May 17, 2016 9:14 PM in response to Loner T

-bash-3.2# diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *251.0 GB disk0

1: EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 185.1 GB disk0s2

3: Apple_Boot Recovery HD 650.0 MB disk0s3

4: Microsoft Basic Data BOOTCAMP 65.0 GB disk0s4

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: Apple_partition_scheme *1.2 GB disk1

1: Apple_partition_map 30.7 KB disk1s1

2: Apple_HFS Mac OS X Base System 1.2 GB disk1s2

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk2

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk3

/dev/disk4

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk4

/dev/disk5

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk5

/dev/disk6

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk6

/dev/disk7

#: TYPE NAME SIZE IDENTIFIER

0: untitled *6.3 MB disk7

/dev/disk8

#: TYPE NAME SIZE IDENTIFIER

0: untitled *2.1 MB disk8

/dev/disk9

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk9

/dev/disk10

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk10

/dev/disk11

#: TYPE NAME SIZE IDENTIFIER

0: untitled *524.3 KB disk11

/dev/disk12

#: TYPE NAME SIZE IDENTIFIER

0: untitled *1.0 MB disk12

-bash-3.2# diskutil cs list

No CoreStorage logical volume groups found

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Answer 8

Loner T

Level 9

59,536 points

May 18, 2016 6:33 AM in response to KF207

This looks usual. What are the installed versions of OS X and Windows?

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Answer 9

KF207 Author

Level 1

8 points

May 18, 2016 1:04 PM in response to Loner T

Windows 8.1 and Yosemite 10.1 if I remember correctly

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Answer 10

Loner T

Level 9

59,536 points

May 18, 2016 2:50 PM in response to KF207

Can you post the output of the

fdisk /dev/disk0

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Answer 11

KF207 Author

Level 1

8 points

May 18, 2016 5:37 PM in response to Loner T

-bash-3.2# fdisk /dev/disk0

Disk: /dev/disk0 geometry: 30515/255/63 [490234752 sectors]

Signature: 0xAA55

Starting Ending

#: id cyl hd sec - cyl hd sec [ start - size]

------------------------------------------------------------------------

1: EE 1023 254 63 - 1023 254 63 [ 1 - 409639] <Unknown ID>

2: AF 1023 254 63 - 1023 254 63 [ 409640 - 361602408] HFS+

3: AB 1023 254 63 - 1023 254 63 [ 362012048 - 1269536] Darwin Boot

*4: 07 1023 254 63 - 1023 254 63 [ 363282432 - 126951424] HPFS/QNX/AUX

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Answer 12

Loner T

Level 9

59,536 points

May 18, 2016 6:06 PM in response to KF207

Can you boot in OS X Safe Mode - Try safe mode if your Mac doesn't finish starting up - Apple Support ?

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Answer 13

KF207 Author

Level 1

8 points

May 18, 2016 6:24 PM in response to Loner T

No it shut down when I tried to go into safe mode.

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Answer 14

Loner T

Level 9

59,536 points

May 18, 2016 6:35 PM in response to KF207

Can you get to Single User Mode - OS X El Capitan: Start up in single-user mode ?

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Answer 15

KF207 Author

Level 1

8 points

May 18, 2016 7:39 PM in response to Loner T

Yes

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