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Why does my MacPro turns off when I start it in 64 bits mode

88 Views 1 Reply Latest reply: Jan 3, 2013 8:15 AM by The hatter RSS
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Jan 3, 2013 8:09 AM

I've been trying to use it in 64 bits mode but whenever I press the 6 and the 4 in the boot it imediatly start to make a litle noise that turns to be faster and faster up to the point that the Mac automaticaly tunrs off.

What's going on?

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