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My friend recently took my early 2007 MacBook and replaced OS X with Ubuntu. I need OS X back. I have the .iso for OS X Lion, now what? Please help, as my knowledge of computers is limited.

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  • What I'd do is to boot from ubuntu live usb or cd, use gparted, errase the ubuntu partition, and then boot from OSX usb or cd and install that Feb 3, 2015 at 2:44
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    We're sorry, but this site is all about Ubuntu and the people here are very good at dual-booting and removing OS X, but not very good at getting it back once it was removed... However, on apple.stackexchange.com, a sister site to AskUbuntu, they're very good at deleting Ubuntu and installing OS X, so you might be better off there. ;-)
    – Fabby
    Feb 3, 2015 at 16:34
  • Make a bootable os x istallation disk, insert and reboot your mac, after the startup chime hold c-key (to boot from cd/dvd). After that the .iso image will boot and you can choose disk-utility to format/erase the previous os of the hdd. After that simply install os x.
    – v2r
    Feb 9, 2015 at 22:22

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  1. Burn it to a DVD or USB/pendrive USB.
  2. Go to the boot menu if you can. If you don't have, then go to the grub menu to then select the DVD/USB/pendrive USB. Grub menu can also use just a iso file. Which means you could skip step 1!
  3. Do the setup and select it to install over Ubuntu.
  4. Reboot, you should now go to OS X.
  5. If it doesn't and shows instead a no OS found or a blinking underscore, try again.

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