[nSLUG] sudden shutdowns

Vikram Chhatre crypticlineage at gmail.com
Mon Feb 11 12:52:52 AST 2008


The system will shutdown even without plugging in the USB device.  This 
is a front usb plug like you mentioned, and it has always worked fine.  
My printer is always plugged in there and has been working fine until 
this problem started.  Now that you mention this, it occurs to me that 
of the two usb plugs, only the lower one works, I have never been able 
to get the upper one working.

86F was without load, not sure how much it is in the X?  The shutdown 
must have happened sometime in the night, because when I woke up, the 
machine was off.  Then I tried powering it up and it would shutdown in a 
couple of minutes every time (even when usb key wasn't plugged in).   No 
other action on my part other than plugging in the usb key would trigger 
this event.


Bill Davidson wrote:
> Hi:
> You say the system shuts down as soon as you plug in a usb flash drive.
> Does it always shut down when you plug in that usb device?  What about
> other usb devices?  Have you ever plugged usb devices into that usb port
> before?  Does the computer shut down f you don't plug in the flash
> drive?
> The reason I ask is that I once came across a system (not a homebrew but
> one somebody had bought pre-assembled) where the front-panel usb ports
> were connected backwards.  The typical motherboard usb header has pins
> that go +5V,D+,D-,Gnd.  If you plug in the cable backwards you can
> connect +5V to ground creating a dead short.  On the one I saw the usb
> driver chip was rather warm (i.e., burn your finger if you touched it).
> 86F is not hot for a cpu temp, so I doubt that is the problem.  Power
> supply is always possible, but again, if the shutdowns only happen when
> you plug in a usb drive, then I would say that rules out the power
> supply and points to a problem with the usb device or the usb port.
> On Mon, 2008-02-11 at 09:36 -0600, Vikram Chhatre wrote:
>> nSLUGers,
>> It seems like I am destined for hardware problems this month. 
>> This weekend my home computer suddenly started shutting itself down 
>> without any warning or signs.  This is a AMD XP 2200+ machine that I 
>> built 4 years ago when I was a student at Dalhousie.  It has served me 
>> well over the years.  Last month I upgraded from Slack 10.0 to 12.0 and 
>> things were working great until this problem started. 
>> About the time when I was planning the upgrade, I also opened up the 
>> machine and cleaned up all the dust that had collected in the box.   
>> There was a lot of it.  I should have really serviced / replaced the cpu 
>> fan/heat sink but I just cleaned as much dust as I could without taking 
>> the heat sink off.  Now I am wondering if my CPU is overheating causing 
>> the system to shutdown.
>> Since I was still tweaking my new Slackware version, I was in runlevel 
>> 3.  I thought I should be able to quickly copy my working files to the 
>> flash drive without having to start X, but the system shuts down as soon 
>> as I plug in the usb flash drive.  The BIOS shows cpu temp at 86F.
>> Tonight, I plan to take the heat sink and fan off and replace it with a 
>> new one thats been lying around.  Perhaps that will make the problem go 
>> away.  In the meantime, it would help a lot to hear what you guys think 
>> the problem could be.   I will also open up and take a look at the power 
>> supply and test the voltages.  From what many of you said before, its 
>> quite likely the PSU is failing.  But would that cause problems like this?
>> The /var/log/messages has no relevant information about the sudden 
>> shutdowns. 
>> Thanks
>> Vikram
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