How's this for a good one... my PERFECT Macbook Pro 2013, that I have used without ANY problems for YEARS, along with 2 x Dell 23" CCFL LCD monitors, has "gone bad" on me.
Most bizarrely, I packed up the macbook, monitors, cables (ie everything) and brought it all home so I could 'work from home' under our local Covid19 lockdown. I plug it all back together and all of a sudden I'm experiencing insidious low level headaches and eye strain. Now this is a setup that has proved utterly faultless for me over the years. I've tried no lcd lights on, different angles, distances and various permutations such as resetting the PRAM. The OS does not appear to have had any recent updates either.
I've now completely reinstalled the laptop to an older OS - High Sierra - and, well, the problems are still evident. So I'm at a loss...
Fortunately my good PC is still workable so I am able to be productive. The thing is I experienced a similar situation with my PC (but not laptop) a while back. Things came right - around about the time I got my prescription updated - so maybe my prescription has changed??! But I don't totally buy that. Then it was PC bad, laptop good. Now it's laptop bad, PC good.
Either way, I cannot get my eyes checked due to the COVID lockdown and probably won't be able to for quite some time. All told, I'm completely bamboozled by all of this.