DarkDragon85 Posted July 23, 2011 Share Posted July 23, 2011 Hi, until now I had installed Lion on external HDD and Snow Leopard in the internal HDD. When I booted the Mac I pressed the Alt key and I chose the external HDD to start Lion. But now I did the opposite: I have on internal HDD Lion and on USB Snow Leopard ... just that when I press alt at boot, the Mac don't recognize that it is plugged an external hard drive ... does anyone know why? Thank you so much!!! Link to comment https://www.insanelymac.com/forum/topic/263258-update-to-lion-then-snow-leopard-usb-dont-boot/ Share on other sites More sharing options...
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