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I have a problem with ubuntu 12.04. It shuts down randomly, just power off. I changed the powersupply and it still happens. I have a new computer with ASUS P9X79 Pro motherboard and INTEL CPU CORE I7-3930K. The CPU is water cooled so there is no problem with high temp. Power supply has max at 750W and graphic card is not power-hungry (quadro 600). Any suggestions?

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closed as too localized by fossfreedom Dec 20 '12 at 23:10

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Sounds distinctly like an over heating issue. Are you 100% sure you fitted all the water blocks correctly? Didn't forget the heat paste and don't have any air bubbles slowing the flow? – SingedWings Dec 20 '12 at 21:44

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