Since upgrading to Windows 10 (which installation was smooth and uneventful), there has been, and still occurs, the occasional, very quick screen flashes. It is intermittent and inconsistent re when it happens.
I have chosen to personalize my Desktop to my own Theme, which is a Taupe-coloured screen for when I am not using any apps.
I have also chosen to change the Settings for Text Size for Menu Names, browser address bar text, Tooltips, and for Icons that appear on my desktop, eg Recycle Bin and my own letterhead document icon. The icons on my Taskbar are still the standard size. And, for instance, inputting text into this post editor is slightly larger than it would be normally (now size 11 points), which all means things are a lot easier to read. I wear spectacles and have cataracts forming in one eye, hence trying to ease my reading on the PC and reduce the amount of light emitting from the screen when in an idle state. The screensaver is de-activated.
However, the screen flashing happened even before I changed these settings.
The Lock screen is standard Windows 10 theme.
Any clear-cut advice as to what this could be would be appreciated, as well as any instruction on how to fix this. Thanks.