[ubuntu] Computer Shuts Off - PLZ HELP

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http://ubuntuforums.org – Hello everybody, i am on a laptop and I installed Ubuntu last night and absolutely love it. The only problem I'm having is that my computer shuts off. I had the exact same problem with windows xp and vista, I figured out that it had something to do with the Hibernation/Lid/powermanagement features with turning hard disks off after a certain time. If I disabled all those features in windows (vista) the computer didn't automatically shut down. ( Computer got sluggish then bam) At first I thought it was a power source problem or a graphics problem, but pinpointed and fixed on the windows side. (Hardware)