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Try reseting the NVRAM. To do this, just hold Option-Command-P-R after the chime sound. If this doesn't solve the issue, boot using the verbose mode (just hold Command-V after the chime sound) and let's see why the restart process does not restart... Here you have all the boot commands: http://support.apple.com/kb/HT1533


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It is possible for the memory to be faster if the hardware supports dual or quad channel memory. I don't know if Mac has this option or not. Many Windows and Linux computers with high end motherboards support this.



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