IMAC OSX install help?

Discussion in 'iMac' started by itegypt, Jan 11, 2015.

  1. itegypt, Jan 11, 2015
    Last edited: Jan 11, 2015

    itegypt macrumors 6502a


    Aug 6, 2011
    I got a couple of years old iMac that someone installed just windows on it and deleted the OSX partition!
    I’m trying to make it boot from a Yosemite USB Ext drive install or even access CMD-R so I can format and restore it back but no luck. I thought the Apple BT keyboard and mouse isn’t connected so I tried a windows USB keyboard, still it just boots then after the grey screen it boots right to windows.

    Any ideas please?
  2. Fishrrman macrumors G5


    Feb 20, 2009
    Have your external drive connected and turned on.

    Reboot and hold down the option key as soon as you hear the startup sound, and KEEP HOLDING IT DOWN.

    The startup manager should appear, showing you all the volumes from which you can boot.

    Do you see the external USB volume? If so, select it with the pointer and then hit return.

    Any better?

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