FC9 x86_64 powers off unexpectedly

[stan]

Dan Farmer wrote:
> Hi All,
>
> My system has been spontaneously powering off once or twice a day for
> the last week or so. The obvious candidate would be thermal issues, so
> I took some steps to improve cooling and I believe that is fairly well
> resolved. At the last power off that I was present for I checked the
> CPU temp in the BIOS when it booted up and the temp was 45 degrees C.
> I also tweaked some settings related to cpu voltage and powersaving
> settings that seemed to help a bit (?). But still my longest run of
> uptime has been about 18 hours.
>
> I recently built this sytem, the specs are as follows:
>
> System specs:
> Fedora Core 9 x64_64
> 500W power supply
> Core2 Duo E8400 proc @ 3Ghz
> 4 GB RAM
> GIGABYTE GA-EP35C-DS3R LGA 775 Intel P35 motherboard
> nvidia geforce 8800 GT
>
> I've built plenty of systems before that never have had problems, but
> I wouldn't completely rule out "build quality" I suppose -- I just
> think it's unlikely. Can anyone give me some direction on what else I
> can investigate? Any log files, BIOS settings (I know that's a little
> out of the scope...), etc?
>
> Thank you! Other than the intermittent loss of power I've really been
> digging FC9 :)
>
> -Dan
>
>   
This sounds like a power supply problem to me.  A bad component that 
overheats after running for a period of time.