On Thu, Dec 18, 2014 at 11:59 AM, King Beowulf <kingbeow...@gmail.com>
wrote:
>
> On 12/18/2014 10:01 AM, Denis Heidtmann wrote:
> > Twice now I have observed after shutting down  my desktop the machine
> > appears to shut down (light off, fan stopped), yet the 'Num' light on the
> > keyboard is on and the mouse light is still on.  The first time this
> > happened I started the machine in the usual way, and I believe it behaved
> > normally.  The second time this happened I interrupted power to the box.
> > When the power was restored the lights remained off.
> >
> > I am assuming that this observation indicates the USB power remained on
> > after shutdown.  If it  happens again I will check the USB power.
> >
> > Any comments on this observation, and possible explanations?
> >
> > Thanks,
> > -Denis
>
> Is there possibly a BIOS setting that keeps USB power on for external
> devices or changing, such as on some laptops?  If this is intermittent,
> there may be a motherboard problem (leaky caps?) or power supply issue
> on the 5V rail.
>
>
> -Ed
>

It is intermittent, as I have seen it only twice after daily shutdowns. The
PS is only 3 months old.  The MB is 5 1/2 years old, so it could be a
warning of disasters yet to come.

-Denis
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