System Shutting Down Unexpectedly (Ubuntu 10.04)

[NoOp]

On 07/28/2010 04:30 PM, Tom Browder wrote:
> A few weeks ago my desktop system started shutting down into some kind
> of sleep state.  In order to get it running again I have to push the
> power on, then power off, and power on again.
> 
> I have had the same problem with the latest couple of kernels.
> 
> I have the same kernels on my laptop which is not having the problem.
> 
> Both systems are 64-bit, but the desktop uses nvidia and the laptop does not.
> 
> I can't see anything that looks like a problem in my logs that I recognize.
> 
> Any suggestions?

Had the same issue on one of my old test machines; problem was thermal
shutdowns of the cpu. Sometimes bios would catch the shutdown and
provide a 'thermal shutdown' error message, but most times not. Install
lm-sensors & sensors-applet & monitor your temps & fans. This probably
won't catch it completely either, but may give you some indication of
what your system internals are doing.

You may get lucky & just need to clean the fans, dust bunnys, and
re-thermal paste the cpu. If not, you can also try bench stripping the
machine (disconnect all but the most essential peripherals), check the
voltages and letting it run continuously for some time to see if it
still dies. If not, add another peripheral (that means NIC cards etc. as
well), repeat.

I'd be shopping around for a new motherboard were I you, because if it
isn't a peripheral problem & the clean/re-thermal paste et al doesn't
work it will be quite hard to catch. :-(