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After installing Windows 8 MacBook Air is not booting. I want to revert back to OS X. I need help on how to do that.

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press the Option key + R select the disk that installed Mac OSx. maybe you're starting with Windows.

Now if you want to a new installation, you will need access to another Mac, to mount the flash drive installation. follow these steps: http://osxdaily.com/2015/09/30/create-os-x-el-capitan-boot-install-drive/

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    Please improve your answer: boot to Recovery Mode/Internet Recovery Mode -> Disk Utility -> Check / Erase Volume/Disk -> Restore OS X – klanomath Feb 2 '16 at 13:29
  • Because improving my answer? I told him does not work? it can not mount a USB stick installation on another computer and reinstall the system? – Mirone Feb 2 '16 at 16:29
  • Because your answer is incomplete and frowsy. The first half of the first sentence is the right direction. In case the OP has no second mac/no thumb drive there is still a solution like indicated in my comment. – klanomath Feb 2 '16 at 16:43
  • at the moment it does not have a connection to the internet your solution does not work well. – Mirone Feb 2 '16 at 16:59

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