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Unable to boot via USB

889 Views 4 Replies Latest reply: Nov 18, 2012 7:26 AM by Joakim788 RSS
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Nov 17, 2012 3:46 AM



I currently bought a Sandisk SSD 240GB to my 15" Macbook pro. Therefore I would like to install Mountain lion on it. (It was brand new when i bought it, so its already empty).


I tried to create a bootable USB unit, by following this tutorial exactly (it succesfully installed):


But whenever i try to boot my mac with the USB plugged in, pressing the option key, I am unable to boot from the USB. As far as I know, i should be able to view and select the disc image in order to install Mountain lion, but I dont have that option. Instead I am only able to connect to the internet, and nothing else.


Even if I boot with my old harddrive (Toshiba 500GB), I dont get the option either to boot via my USB disc image.


Note: My USB device is a Samsung 1TB.



MacBook Pro, OS X Mountain Lion (10.8)


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