System rebooting

[Colin Law]

On 10 September 2014 18:51, Bob <ubuntu-qygzanxc at listemail.net> wrote:
> ** Reply to message from Karl Auer <kauer at biplane.com.au> on Wed, 10 Sep 2014
> 15:31:39 +1000
>
>> On Tue, 2014-09-09 at 21:50 -0700, Bob wrote:
>> > The system is rebooting at random times for some reason.  I looked in the
>> > SYSLOG but do not see anything that indicates the reason.  Is there some place
>> > that would indicate what the reason for the reboot is?
>>
>> You almost certainly have a hardware problem, probably something to do
>> with the power supply. Unless you have reason to suspect the actual
>> grid, I would check all power connections from the socket to the
>> computer first in case something is loose. It could also be a failure in
>> power just to the drive, or a loose controller - double check that all
>> internal connections are good too.
>>
>> > In the SYSLOG I see a long string of ^@ characters at the time of the reboot.
>> > What do these characters mean?
>>
>> That's typical of a very sudden stop. ou probably should run a
>> filsesystem check on that drive.
>
> This reboot problem just poped up but a few months ago I had a power supply go
> bad.  It was built into the case and I had to buy a new case and power supply.
> So it is likely that there is a loose connection after I moved the mother board
> to the new case.
>
> I will also check the memory as Colin suggested.

Running memtest will not only check the memory, if it reboots during
the memtest then you can be confident it is a hardware issue, not s/w.

Colin