|Was the monitor powered on before you got there ? If yes, why ?|
"My computer workd fine with other monitors."
If that's supposed to be "My computer works fine with other monitors"
as in, it works fine with other monitors NOW, the Samsung monitor is defective, if you're plugging the other monitors into the same video port.
If it's still under warranty, if it's your responsibility, take it to a local place that is authorized to repair Samsung products.
If it's NOT still under warranty, take it there anyway and get an estimate. In some cases it's relatively inexpensive to fix it.
E.g. A friend's older LG LCD model did that - I opened it up and took a look, found a failed capacitor - I replaced two made by the same brand with high quailty ones - parts less than 10 bucks.