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I have tried all posted solutions about this topic, but none seem to be successful. I have a feeling that my computer is running way too hot and that is why it is shutting down.

It has always been a problem that under Ubuntu (under Windows it works fine), the power consumption is terrible and it is always very hot and all CPU's run at 100% (without any applications actually taking up the processing power, like immediately after start-up).

I have a standard Samsung q430 with a Nvidia GeForce 310M graphics card, and an Intel Core i3-350M. I have seen that it may be a graphics driver issue.

Also, I have tried installing bumblebee and it really messed with unity and many other applications, so that is not really an option for me. Here is a screenshot

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Where is the screenshot? Also, what drivers for nvidia are you using? Can you get us the output of sudo lspci -nnk | grep -A8 VGA? Can you check this answer and tell us the accurate temperature? –  Braiam Sep 8 '13 at 9:44

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