One problem with that type of hdd hang is that switching vt can require disk access so it can be impossible to get the log data. Having a window open for viewing the syslog via /dev/xconsole or logging to another system can be helpful. On 18 May 2014 4:17:29 PM AEST, zlinw@mcmedia.com.au wrote:
Dave Hellewell <dave.hellewell@gmail.com> said,
Power supply is next easiest thing to test if you can find a spare. Do the input voltages seem okay? Even if they do it's possible it could still be the power supply.
My sensors output is pretty wacky (haven't gotten around to a proper config), but the BIOS reports numbers that look OK. I have another PSU
here and I'll give that a spin as a last resort before submitting to the shop.
Neither the bios or any software voltage monitoring are any good in diagnosing PSU problems as neither reads voltage continiously. For the same reason most digital voltmeters are no good. What can happen (I have had it twice) is the PSU voltages can spike down very quickly and cause the system untold problems. Such a spike will NOT be picked up by most voltmeters. I have successfully used analog meters to
check this though (An AVO). All voltages need to be checked including the 12 Volt line. In both my cases the system lockups were caused by the 12V line droping low (11.2 volts) for only around half a second, causing the hardisks to shutdown.
This caused an unrecoverable error from the kernel.
The symptoms in my case was an almost complete hardlock up but with the
mouse pointer still working.
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