Question: MacBook Pro Screen Flashes
The screen on my 2017 MacBook Pro "flashes" every 20 minutes or so. Not a real problem, no lost data, not even long enough to lose my place when I'm reading.
At first I worried this was some sort of virus or spywear, using the camera to - - - I don't know what.
But now, I wonder if it is somehow connected to notifications, or hardware testing.
Even more, I wonder if there might not be a simple answer, if I just take the trouble to post this question.
Thank you for any useful, or amusing, counsel.
PowerBook, Mac OS X (10.4.7)