9.0 spontaneously reboots

Da Rock freebsd-questions at herveybayaustralia.com.au
Mon Mar 12 22:49:22 UTC 2012

On 03/13/12 02:56, Matthew Seaman wrote:
> On 12/03/2012 14:07, Volodymyr Kostyrko wrote:
>> What should I blame now? Is it some programming error or should I
>> continue with testing/changing motherboard and cpu?
> Instability that appears spontaneously (and especially if it persists
> across system updates) is almost always caused by hardware problems.
> So, yes, carry on swapping out components until you can isolate where
> the problem is.
> Some common hardware problems which might result in the problems you've
> seen:
>     * PSU going flakey.  If you have the right measuring equipment, this
>       is pretty easy to detect by looking at the output voltages -- if
>       they've drifted out of spec, or if you've got mains frequency
>       jitter leaking through then its no wonder your system crashes.
>     * Similarly, if the crashing is associated with system load,
>       (particularly at startup, when things are happening like disks
>       spinning up) this can indicate a power supply fading under load.
>       That can happen due to age, or because you've been adding extra
>       hardware and haven't considered the power requirements.
>     * The other reason for crashing under load is overheating.
>       Sometimes this can be cured easily by cleaning dust out of vents
>       and heat-sinks.  Check too for fans either seized or running
>       slowly.
>     * You may need to clean off any old heat-sink compound and re-apply
>       a fresh layer, especially if you've taken CPU coolers off at
>       some point.
>     * There's also the old capacitor problem: electrolytic capacitors
>       have a failure mode that generates some positive pressure inside
>       them.  This is detectable by the end of the capacitor being bowed
>       out, rather than slightly concave. (Generally this means a new
>       motherboard, although I've heard of people being able to solder in
>       replacements successfully.)
Yes, that works (relatively easily); but you need to be good with a 
soldering iron and be able to remove the cap without breaking tracks or 
shorting them. If you're not that or confident, I wouldn't try; although 
if the MB is cactus anyway you may have nothing to lose :)
> Other than that, try disconnecting and reconnecting peripherals like
> disks or DVDs and so forth in various combinations to test if that
> improves system stability.  One faulty component can knock the whole
> machine over.
> 	Cheers,
> 	Matthew

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