I have two Samsung 216BW monitors that are acting up, and I'm pretty sure both have a decent chance being caused by bad capacitors. When either is off for around 30 minutes, several minutes of flickering and hitting power switch repeatedly is needed to get them to turn on. One will flicker really fast for a bit, then turn off. When I cycle the power switch a few times, it eventually stays on. The other stays dark until I cycle the power switch a few times, then starts flickering, and after more cycling eventually stays on.

Once they're on, unless they turn off, they're good to go....