Unable to go to Mac from Windows 10

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Level 1

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Unable to go to Mac from Windows 10

I have downloaded Windows 10 on my Mac but I can't go back to Mac OS. When I hold down the option key it only gives me an option for Windows. I've tried making Mac OS active from Windows but it didn't let me. What should I do to get back to Windows.

iMac

Posted on Jan 30, 2016 2:09 PM

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Answer 1

KiltedTim

Level 10

195,909 points

Jan 30, 2016 2:12 PM in response to Fansn

How, exactly, did you install Windows 10 on your Mac? Did you use the Boot Camp Assistant? Or did you just re-format the drive and install Windows?

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Answer 2

Kappy

Level 10

361,741 points

Jan 30, 2016 2:13 PM in response to Fansn

You need to try reinstalling OS X. It would appear that in instilling Windows you have corrupted or erased your OS X volume. Have you tried booting from your Recovery HD?

Boot Using Command+R keys:

1. Restart the computer.

2. Immediately after the chime press and hold down the

"COMMAND" and the "R" keys together.

3. Release the keys when the Utilities Menu appears.

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Answer 3

Fansn Author

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Jan 30, 2016 2:26 PM in response to Kappy

It loaded up on a screen where its telling me to pick a wifi network and a spinning Earth on top. It's staying on this screen

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Answer 4

Fansn Author

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Jan 30, 2016 2:29 PM in response to KiltedTim

I used boot camp assistant

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Answer 5

Kappy

Level 10

361,741 points

Jan 30, 2016 2:32 PM in response to Fansn

Install OS X Using Network Recovery

Be sure you have backed up your files because the following procedure will remove everything from the hard drive.

Boot to the Network Recovery Server:

Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.

Partition and Format the hard drive:

Select Disk Utility from the main menu and click on the Continue button.
After DU loads select your newly installed hard drive (this is the out-dented entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Apply button and wait until the process has completed. Quit DU and return to the main menu.

Reinstall OS X: Select Reinstall OS X and click on the Continue button. Be sure to select the correct drive to use if you have more than one.

Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.

This should restore the version of OS X originally pre-installed on the computer.

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