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Thread: Diagnosing random reboots

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  1. #1
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    Diagnosing random reboots

    Hello all,
    I have a server/workstation that has been running smoothly for the last 4 years or so. The last night it started doing random reboots: screen goes black and the machine boots just like that. I've had 6 reboots so far, including one while the machine wasn't yet finished booting. Temperatures are fine. Smartctl tells me my drives are fine. I don't see anything strange in the kernel or system logs. How can I diagnose this besides taking the machine apart ?
    Thanks
    Last edited by dargaud; May 24th, 2013 at 04:00 PM.

  2. #2
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    Re: Diagnosing random reboots

    ~
    Last edited by ahallubuntu; June 27th, 2013 at 09:45 PM.

  3. #3
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    Re: Diagnosing random reboots

    As ahallubuntu said, a complete cleaning and reseating. Then put a voltmeter on your power supply and verify your voltages during operation. Leave the meter on and see if you get voltage dropouts. It could be your power supply is failing. Do you have an UPS? It could also be issues with your house power.
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  4. #4
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    Re: Diagnosing random reboots

    Thanks guys.

    My hardware answered my question for me: it croaked during the night an hour after I posted the question. The front lights come up, but no POST, no BIOS screen. So it's a hardware problem, either power supply (but there's light), mobo, memory or some PCI card that's causing major lockup. I will take it apart tonight see if I can figure it out.

    PS: in case I need to change mobo, is it OK to go from AMD64 to Intel64 and keep the some OS or do I need to reinstall Ubuntu from scratch (horror!) ?

  5. #5
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    Re: Diagnosing random reboots

    You should be OK, linux detects hardware on boot, so as long as you are still 64-bit. Let us know what you find. Perhaps your server was upside down for too long--being in the extreme south.
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  6. #6
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    Re: Diagnosing random reboots

    ~
    Last edited by ahallubuntu; June 27th, 2013 at 09:45 PM.

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