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I have bought a used core i5 3210/ 8GB RAM pc from a friend. But it freezes randomly for like one seconds or less and then continues to work. for example, if I'm typing something in the terminal it takes what I type and then proceed all the commands at once.

Can you help me find out what causes this little freeze?

I have erased the hard-disk and reinstalled a fresh copy of ubuntu so I'm pretty sure it's not a software-related problem.

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    I'd first check the memory of the system using memtest or whatever tools are available. It is always a good idea to run hardware test first in used pc before purchasing or go with other diagnoses. – Biku B. Oct 20 '18 at 7:01
  • can bad memory cause little freezes? – Adam Oct 20 '18 at 7:08
  • Bad memory can cause a lot of problems or show symptoms. Little freezing is one of those symptoms. Since you've erased hard-disk and reinstalled a fresh copy of Ubuntu, I'd say it's more likely that you've hardware issue. So it's better if you make sure first that your hardware is fine. – Biku B. Oct 20 '18 at 7:11
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    It may be if you feel that you're pc is unusually hot or fan creates more noise. Most of the pc vendors nowadays (Dell & HP) have inbuilt hardware diagnostic option in BIOS which you can use to check your overall status of your PC including motherboard & cooling system. As my first comment, I still urge you to do overall hardware test first before you jump to other conclusions. – Biku B. Oct 20 '18 at 8:02
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    It's entirely possible its CPU as well, but you haven't given us much info. If it was a cooling issue you could easily look at the CPU temp. If it spikes above 60-70*C idle, then you likely have a cooling issue. As others have mentioned, a simple hardware test will give you the answer. Run a memtest, prime95, storage benchmark, etc. – Dan Oct 20 '18 at 9:51

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