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Sounds like a weak power supply/heavy draw on the USB port.<br>
Keyboards can sometimes be surprising power sinks.<br>
It would not surprise me if you took the USB3 hub out your <br>
problem would go away.<br>
<br>
<br>
<div class="moz-cite-prefix">On 07/25/2016 10:59 AM, CrankyOldBugger
wrote:<br>
</div>
<blockquote
cite="mid:CAKyYXOQEyvP+c7a=y3ZtPnvANAnX1-2bArNuyH56Pi8zRYcbDQ@mail.gmail.com"
type="cite">
<div dir="ltr">
<div>I have an older machine running Ubuntu 16.04. I'm having a
strange problem with booting it.</div>
<div><br>
</div>
<div>The system is a Intel® Quad-Core Processor J1900 + Micro
ATX Motherboard (one of those motherboard with CPU bundles
from Canada Computers).</div>
<div><br>
</div>
<div>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.)</div>
<div><br>
</div>
<div>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?</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Any ideas?</div>
<div><br>
</div>
</div>
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