I've had two Samsung monitors that have done something similar-they would take forever to come on at boot, or out of standby. They would flicker and eventually come on, but once they were on, they stayed on. Eventually, though, they got to the point where they would not "wake up" anymore. Both had bad capacitors, and took probably 5 minutes to fix. And both are still working fine to this day. At this point, you have nothing to lose by opening it up and looking around.