Ubuntu shuts down, or overheats (but sensors indicate max ~50c), windows does not...

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http://ubuntuforums.org – Hi everyone, My debut on these forums: I have been using ubuntu for some time now and mostly on an old pc for multimedia purposes (so that's my main experience). I also run a dual boot (win7/ubuntu12.04) setup on my laptop which is a Fujitsu Siemens, Amilo Pi 2530. However, ubuntu has not been working well on my laptop. During the last year my laptop had serious CPU-overheating issues in both windows and ubuntu. I am no expert on hardware, so a friend offered to show how to properly remove dust from the fan and replaced the heat-transfer paste on the motherboard. After this, my max temperat (Hardware)