Consider this sorted. I changed the monitor for another LG Flatron from our old 
computer, and it is behaving well. I guess  the old monitor is giving up.

Peter

On 14/12/2022 18:30, Hamish McIntyre-Bhatty wrote:
I think it's more likely that you have a bad display cable, perhaps?

Hamish

On 14/12/2022 12:28, Peter Merchant wrote:
I seem to remember a discussion some time ago about changing screen firmware 
from NVidia to Nouveau. Is it possible that doing this would fix my problem?

Peter( this time using his correct email address!)

On 13/12/2022 21:50, Peter Merchant via dorset wrote:
Just now when this occurred, I switched off the monitor, and after a few 
seconds switched it back on and the screen came back to life. So the problem  
isn't with Kubuntu, unless there is something in the graphics causing it. Maybe 
my screen is getting old.  It's random because it didn't occur at all 
yesterday, and has happened a few times today.

Peter


On 11/12/2022 12:55, Peter Merchant wrote:
If I leave my  Kubuntu 20.04 for awhile, I have usually left Thunderbird and 
Vivaldi up, and when I come back and try and do something the computer goes off 
into never-never  land, the screen goes blank, and I can hear the HD crunching, 
and it needs the power button hold down to shut it down.

I think that this has happened after a boot up, if I have left it for awhile 
and I hit T'bird and Vivaldi  one after the other to bring them up.

Any thoughts on where I should look to track this problem?

I am tempted to bleachbit the computer, or to replace Vivaldi with Opera on the 
offchance that Vivaldi is the cause.

Cheers,

Peter










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