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I have had 3 operating systems(Ubuntu, Win7, Win8) on my computer and I have reformatted the drive for every new install. Sometimes all of a sudden my computer is really slow(I can barely minimize a window). When I check the task manager I see that there is no difference process wise (cpu usage %, mem usage) compared to when it's working normally. I really have no idea what to do in this situation, because it doesn't make any sense to me. How would I be able to diagnose what is wrong with my computer?

Thanks,

Miza

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Does it only happen under one of those operating systems? Or all? –  William Jackson Jun 2 '12 at 12:09
    
You formatted the drive, but did you do a disk check to ensure it's not failing? –  techie007 Jun 2 '12 at 15:18
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This could be caused by a CPU throttling due to overheating. So make sure that the heatsink is correctly mounted and free of dust and the fan is working correctly. You might also want to check the temperature the processor reports to the system. There are various tools to do this, e.g. Core Temp for Windows. For Linux see How can I monitor the CPU temperature under linux?

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