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Update to Lion then Snow Leopard USB don't boot

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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!!!

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