We had a power failure and after power was restored my Samsung SyncMaster 931BF would not display anything from the computer. I turned the power off to the monitor and then back on several times. I checked all connections and nothing was loose. When I turn the monitor on, the blue light near the power switch blinks off and on and hums slightly, indicating there is no signal even though the desktop will flicker on and display for about one-tenth of a second. When another monitor is connected to the PC, everything works and displays fine. Is the monitor shot, or is there a reset button somewhere that I am not locating?

I think it might be the Caps in the power supply. If you can open the unit up, find the power supply. See if there any caps are bulging on the top. If they are they need to be replaced. There maybe as many as 4 to 6 caps you need to replace, If the caps are 16v replace with 25v, If they are 25v replace with 35v. This is because some of these caps in power supplies are under rated. Always use the same mfd's that is on the old cap.Make sure you do not put them in backwards. They do have a + and a - . This is all being said assuming you know a little about electronics and good with a soldering iron. Hopes this is helpful.

Sounds like the monitor. Can you test the monitor on another PC ?