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I have Ubuntu 14.04.1 . When using the pc (usually watching a video on youtube, or something that requires some cpu) it reboots, and then it usually doesn't restart again, you have to switch off and wait for some minutes, then switch on and it works, what could happend? I checked memories and hard disc and Ubuntu said they were ok. Sorry for my English.

Roque
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  • I'm going to guess that your computer is overheating. Is it a laptop? How old is it? – TheWanderer Apr 07 '16 at 23:54
  • It is a desktop 64 bits pc, it has 8 years of use... How could I know if it's temperature? – Roque Apr 07 '16 at 23:56
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    8 years? That's a pretty long time. You should open it up and clean out any dust you find (I'm going to bet there's a lot). Also keep it open and turn it on to make sure all the fans are working. – TheWanderer Apr 07 '16 at 23:59
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    Use this to see the temps: http://askubuntu.com/questions/15832/how-do-i-get-the-cpu-temperature – TheWanderer Apr 07 '16 at 23:59
  • Thanks, I've made all steps, and it says: temp1: +40.0°C (crit = +124.0°C)

    k8temp-pci-00c3 Adapter: PCI adapter Core0 Temp: +37.0°C
    Core0 Temp: +22.0°C
    Core1 Temp: +31.0°C
    Core1 Temp: +22.0°C

    Is it right? I will clean inside it.

     – Roque Apr 08 '16 at 00:05
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    Well that looks OK right now. I'd do what you do to make it shut down and monitor those temps at the same time. – TheWanderer Apr 08 '16 at 00:06
  • I'm hearing a video on youtube and using a virtual machine, and temperature doesn't get high... Could it be another thing? Thanks for your help. – Roque Apr 08 '16 at 00:07
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    I'm not sure. Give it a bit, and definitely clean the computer out. – TheWanderer Apr 08 '16 at 00:08
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    I'm here to help :) – TheWanderer Apr 08 '16 at 00:12
  • Sorry for annoying again, after some hard use it says temp1: +40.0°C (crit = +124.0°C)

    k8temp-pci-00c3 Adapter: PCI adapter Core0 Temp: +61.0°C
    Core0 Temp: +62.0°C
    Core1 Temp: +59.0°C
    Core1 Temp: +61.0°C Is it still right?

     – Roque Apr 08 '16 at 00:24
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    Strange. It's getting higher, but I don't think it's to the point of shutting down. However, I still believe it has something to do with heat, so definitely clean the computer. – TheWanderer Apr 08 '16 at 00:25
  • Thanks a lot, more than 80º would be dangerous? – Roque Apr 08 '16 at 00:26
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    Well, it says the maximum for your CPU is 124˚, but that seems really high. I think 70˚ is pushing it, and 80˚ is definitely bad. – TheWanderer Apr 08 '16 at 00:28
  • It may not be the CPU but possibly the PSU because as mentioned it usually doesn't start back up again after it shuts itself down. The first thing I'd do is try a spare PSU for a few days and see if it keeps shutting down. – Software_Programineer Apr 08 '16 at 01:55
  • Have you checked for BSOD error? – Alexiy Apr 08 '16 at 05:28
  • Its a common issue with unsupported GPU - they overheat and the system shuts down. I have a few old notebooks where i couldnt find a fix except physical measures. All you can try in this case is to load proprietary drivers or use an outdated OS that supports the GPU –  Apr 09 '16 at 00:59

2 Answers2

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There are things that could cause this, one is heat as others have mentioned, and another is the power supply. Open the side of the pc if this is a desktop, and leave it open. Start up the pc. If it stays on, heat is your issue. Try blowing it out with a blower or another less preferred option is to use the vacuum cleaner to remove dust from the heatsink on the cpu.

If this does not solve the problem replace you Power Supply. The fact that it doesn’t come on for a while after the shutdown is making me suspect static in the power supply.

warhansen
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sudo apt-get update

sudo apt-get upgrade

sudo init 6

after it restarts see if it is still happening

muru
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wagyourtail
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