I recently change my hard disk for ssd on my Macbook 7.1. My old hard disk doesn't work, I don't have access to anything.
How Can I install now OS X El Capitan?
At the moment I don't have access to any OSX, so how can i resolve this situation?
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Open the program as an administrator, insert your usb drive, right click on the drive and choose Format the disk for mac, it will take a couple minutes to complete the process, and then right click again and Restore with Disk Image and choose a DMG file,you may get a warning just click YES.
Now Insert your usb into your mac and install the OS.
If you have trouble finding ta DMG of the OS X you prefer, you can download Yosemite from here : http://getintopc.com/softwares/operating-systems/mac-os-x-yosemite-free-download/
(This is not an official link, if you're not sure about the validity of this file and don't want to download this. I suggest finding another machine running OS X, or install it on your machine and from your new OS create another USB bootable device following this method https://support.apple.com/en-us/HT201372 and redo a fresh install)