Originally Posted by
Aniela
Snow Leopard can restore to original startup disks when the Macbook is off, hold down the "C" while the power back up. When started, follow the instructions to install Snow Leopard on the disk. Make sure you are connected to a power source is turned off not until the end.
Once returned to Snow Leopard and you are sure all is well, that Lion upgrade again. Do not turn off your computer when you upgrade. Is in the midst of improving critical parts of the operating system and can leave off critical parts removed.
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