I have another one.
My LCD monitor, 9 months old.
5-6 months ago, this started.
Some day, I start my computer, Windows desktop comes up, and then it goes to black screen for 3 sec, back to desktop for 3 sec, back to black for 3 sec, and so on.
Turning monitor off, and on resolves issue.
It won't happen again after restarting computer, it won't happen again for days.
In a span of last 6 months, it happened to me, maybe 3-4 times, always once at a time.
I see no pattern.
Connections checked, tried different DVI cable.
It's hard to try something else, since it happens so rarely.