Thanks again. I'm way out of my depth.
I have two entries under "Display adaptors" in Device Manager:
AMD Radeon R9 M200X Series
Intel(R) HD Graphics Family
I don't know which one my laptop uses.
A while back, after a Window update I assume, I got a Radeon Software icon in my system tray. I've never clicked on it until now. When I do, it looks like this.
The best I could do to check my laptop manufacturer for what video hardware is installed was to go to the dell site:
https://www.dell.com/support/home/en...-17r-5737/docs
The manual for my 17r-5737 -
https://downloads.dell.com/manuals/a...uide_en-us.pdf - doesn't seem to be much use for what we're talking about.
I don't think I should waste your time much more. Perhaps my laptop is just old and decrepit?
Could I try disabling either "AMD Radeon R9 M200X Series" or "Intel(R) HD Graphics Family"? As I say, I don't know which one is being used at the moment.