I have just switched the two monitors just to see what would happen. So far, the second monitor as the primary monitor went black for about a second, and returned to the display. Could it be that the first monitor is bad? Or is there some sort of setting that I should have set, but haven't?
[edit] Now it has flickered off then on three more times, but not as often as the first.
This is agitating.
[edit2] For a while the first monitor (now secondary) didn't work. All of a sudden, it turns on, but has a yellow tint.