How to install OS X on an iMac?

Discussion in 'iMac' started by raudbul, Sep 30, 2015.

  1. raudbul macrumors newbie

    Aug 20, 2014
    The title might sound stupid but that is exactly what I am looking for. I hate to admit it but I messed up when I wanted to install Windows on my iMac (bad decision) and ended up completely deleting my whole OS X partition. How do I get it back ? I don't have any discs and can only use the Windows 10 I have on my hands. Will I have to somehow download the new El Capitan OS and put it in an USB or what exactly. Please help me.
  2. toddzrx macrumors 6502a


    Nov 20, 2012
    I think you'll have to go to an Apple Store and have them totally refresh your drive with OS X, but I could be wrong. As far as I know, you can only access the OS X installer via the Apple App Store; it's not available for download any other way.
  3. VideoBeagle macrumors 6502a

    Aug 17, 2010
    App Q&A testing by request.
    Do you know if you erased the recovery drive? (I didn't think that as actually possible unless you really try hard to do it...)
    try booting and holding cmd-r...or maybe internet recovery? I've never used it, but I think this is the kind of situation it's designed for:
  4. Toydoll macrumors newbie

    Sep 3, 2015
  5. cbrand493 macrumors 6502

    May 19, 2015
    Perth, Australia
    You should be able to access internet recovery even with a completely blank hard drive. Boot, command + R. Instead of an apple logo you'll see a spinning globe and it'll download the recovery programs temporarily to your drive. From them you can do a clean install.
  6. raudbul, Oct 3, 2015
    Last edited: Oct 3, 2015

    raudbul thread starter macrumors newbie

    Aug 20, 2014
    Well, I live in Tunisia. A North African country where there are LITERALLY no Apple stores nearby and none of my friends owns an Apple device ( I might have to check with some other people and try my luck )
    EDIT : spelling

    Unfortunately, the recovery disk was also removed. I tried Internet Recovery. At first, it didn't work through an Ethernet Cable so I had to move the iMac to use Wifi however the error 2002F popped up ... I read somewhere that I need a WPA network instead of a WPA2 one, I will have to try that and come back but I'd love if there were any solutions to make a bootable USB through Windows. I forgot to mention it but I have a .dmg file with Yosemite 10.10 so all I need is a way to mount into a USB properly. I tired Transmac but I was unsuccessful.
    EDIT 2 : Tried a WPA network and i got the same 2002F error again. :(
  7. raudbul thread starter macrumors newbie

    Aug 20, 2014
  8. toddzrx macrumors 6502a


    Nov 20, 2012
    I suggested the Apple Store because, without knowing where the OP lives, I figured the best and cheapest option was to take his machine to the Genius Bar where they'd do an install for free. The link you posted won't work because it requires the OP to access the Apple App Store, which as far as I'm aware cannot be done on any machine that does not have OS X up and running. He doesn't even have a recovery partition. So far as I know, there's no way for his machine to install OS X without outside help.
  9. mmomega, Oct 3, 2015
    Last edited: Oct 3, 2015

    mmomega macrumors 68030


    Dec 30, 2009
    DFW, TX

    Also if you have a copy of an OS X dmg file, one that shipped on your iMac or later, you can use a program on Windows called TransMac.

    It has a 15day trial so that should give you enough time.

    This will help you create a USB install disk from Windows. Just right click the USB drive from TransMac and choose Restore with Disk Image and point it towards your OSX file.

    You may 1st need to format your USB drive with GPT, the drive won't work if formatted with MBR.
    In windows you can do this through the command prompt and diskpart.
    Have your USB drive plugged in.

    Open a cmd prompt.
    list disk

    **** find the number of the disk for your USB drive
    select disk 3 (<- where the number is the number listed for your USB drive)
    convert gpt
    create partition primary


    I haven't tried this before but you could possibly download VirtualBox, install OSX virtually then you'll have access to the Mac App Store to download a copy of OSX, use Disk Utility or terminal to create a bootable USB drive then reinstall OSX on the computer.
  10. BFaro, Oct 3, 2015
    Last edited: Oct 3, 2015

    BFaro macrumors newbie

    Jan 25, 2013
    Did you do this exactly? Use your .dmg. You need to format the USB for Mac :

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9 September 30, 2015