I have a
Intel Core 2 Duo 2GHz and
Leopard 10.5.8 and I need to upgrade it to
Lion. I've downloaded Lion installation dmg file and restored it to a USB disk using
But when I restart my MacBook holding option key, it doesn't show the USB disk. it only shows my hard disk. I've tried an external DVD-Drive (since the original DVD-Drive is not functional), same problem. Also I've tried restarting through Startup Disk preferences, same problem.