There's a suite of CPU stressing utilities available on Ubuntu called
"CPUburn".
FWIW, I've seen the very similar symptoms to those you described from an
overheating CPU, faulty RAM, faulty/overheating video adapter, or a
faulty PSU. In theory, anything that requires heat dissipation or
handles voltage regulation could be a culprit.
My money would be on the PSU, base on my past experience.
Having said that, since you're using Ubuntu, my suggested first step
would be to leave it running memtest86 for a few hours.
Chris
On Sat, 26 Jan 2013 14:42:18 +0000
Ally Biggs <bluechrome@???> wrote:
> Yeah on windoze boxes I run prime95 in conjunction with speed fan and
> push the system to 100% processing power. Is there a Linux equivalent
> of this? Or a tool that can be run from a live Distro I'm
> intrigued :)
>
> Sent from my iPhone
>
> On 26 Jan 2013, at 14:38, "Michael Daffin" <james1479@???>
> wrote:
>
> > I don't think running in the bios is a good way to test temp, best
> > to do that while it is under some load. I suggest running some
> > stress tests on it.
> >
> > On 26 Jan 2013 14:30, "Rob Malpass" <linux@???>
> > wrote: Hi all
> >
> >
> >
> > My dad (an electronics engineer of 40 years experience) once told
> > me “intermittent faults are a swine to fix” – and never truer words
> > were spoken. Could you all please take a look at my logic before
> > I condemn certain parts of this failing box to the bin?
> >
> >
> >
> > 2008 vintage 64-bit 4Gig RAM machine running Ubuntu 12 fine for the
> > past month – 28 days uptime as my media server and no problems at
> > all. Today I switched the kvm box controlling it to control
> > another machine (no disconnection, just a flick of a switch) and
> > the box powered down! For some reason whenever the bad box powers
> > down, it needs to be physically unplugged from the mains before it
> > will come back up – this particularly baffles me. Brassed off
> > with this, I started to look into what causes random shutdowns
> > (it’s not the first time it’s done this but as I say it’s been fine
> > for 28 days). I left it running for 20 minutes in BIOS to check
> > the CPU temp was fine – and it was at 44 degrees C max. Rebooted
> > to see what dmesg might say but – post BIOS but before boot – it
> > shut itself down. And at that point my anglo saxon became taboo
> > for the good folks on this list!
> >
> >
> >
> > I’m now stumped and, as the machine is 2008 vintage (though good
> > for its time) it might be time to upgrade – but I’m wondering which
> > bits I can salvage. I’m thinking the following are ok to reuse:
> > case, optical drive, hdd whereas any of the mobo, RAM and certainly
> > PSU could well be the trouble and it’s almost impossible to test
> > which.
> >
> >
> >
> > Can anyone offer another diagnosis / treatment for these
> > symptoms? I might be inclined to buy a new PSU and see what
> > happens swapping that before any more major surgery but is there
> > really anything I’ve missed as regards seemingly random shutdowns?
> > Incidentally when I say shutdown – I’m talking immediate power down
> > – not the OS executing a halt command.
> >
> >
> >
> > Cheers
> >
> > Rob
> >
> >
> >
> > Cheers
> >
> > ROb
> >
> >
> > --
> > Please post to: Hampshire@???
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