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.)
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
Aloha,
Have seen the problems Matthew is addressing here in Hawaii. And
if your equipment is in a non climate controlled room check for
corrosion on the board or any plugins. Clean all the cabled and
components that can be removed. (No air-con in my systems here in Hawaii
and humidity is around 60-70% normally so we have to clean and put
teflon on contacts about 2 times a year.) Corrosion is worse if your on
the ocean or brackish river.
Happy hunting.
~Al Plant - Honolulu, Hawaii - Phone: 808-284-2740
+ http://hawaiidakine.com + http://freebsdinfo.org +
+ http://aloha50.net - Supporting - FreeBSD 7.2 - 8.0 - 9* +
< email: n...@hdk5.net >
"All that's really worth doing is what we do for others."- Lewis Carrol
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