unresponsive screen graphics

[Ralf Mardorf]

On Fri, 27 Jan 2017 21:20:32 -0800, rikona wrote:
>> Have you power cycled the system?  
>
>I did not turn off the power completely - I assumed that would not
>make a difference.

In regards to Ubuntu software issues rebooting with or without shutdown
should be enough, in regards to hardware issues it isn't.

Most likely it doesn't make a difference regarding the issue you
experience, but you never know, it doesn't harm to disconnect from power
for a while. Usually (but not necessarily) the power switch of the power
supply does disconnect, but even a shutdown doesn't. Capacitors could
keep charge for minutes, but for computers it usually is enough to wait
a few seconds, before connecting with power again, to get rid of power
related hardware issues.

Could you post a screenshot?