[kwlug-disc] Strange poweron problem

[Khalid Baheyeldin]

Back in 2011, I had a then-recent desktop that was working for a couple of
years. Then it started to hang when booting with "Scanning for USB devices"
or "Configuring USB devices", and would not boot at all.

The only USB device was the keyboard. Unplugging it made it boot fine for
months or more.

I vaguely remember that the motherboard later died and I had to replace the
entire PC, but I am hazy on the details.

On Mon, Jul 25, 2016 at 10:59 AM, CrankyOldBugger <crankyoldbugger at gmail.com
> wrote:

> I have an older machine running Ubuntu 16.04.  I'm having a strange
> problem with booting it.
>
> The system is a Intel® Quad-Core Processor J1900 + Micro ATX Motherboard
> (one of those motherboard with CPU bundles from Canada Computers).
>
> If I try to power on from cold, the power switch does nothing.  No lights,
> no noise, nada.  But if I unplug the USB cable in the back, the power
> switch lights up and away we go.  The USB cable in question is the only USB
> device attached, and it goes to a USB 3 hub on the desk which currently has
> my keyboard and mouse plugged in.  (It doesn't matter if I unplug the cable
> from the back of the PC or the hub itself, the results are the same.)
>
> So my question is why would the presence of a USB device stop the system
> from powering up, and even more so, why would unplugging the cable cause
> the system to suddenly power on?
>
> Sometimes after I do manage to get power on and we go through the POST
> Ubuntu will get stuck, but a repeat of power off, power on, unplug USB
> cable seems to clear that up.  I don't think this is related to the power
> issue but I can't rule that out yet.
>
> While I can live with the frustration of unplugging cables when I'm
> sitting there, it makes rebooting from remote login a pain.  I have maybe a
> one in three chance of seeing the system come back from remove reboot.
>
> Any ideas?
>
>
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>
>


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Khalid M. Baheyeldin
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