Quote: I have a 3 year old 19 inch Medion flat panel monitor
That's your first problem, age. I would suggest that unless you are a fully qualified electrical engineer with experience of taking screens apart along with all the relevant test equipment, you leave well alone and invest in a new one.
The power supply on your PC is not relevant as it doesn't supply power to your screen. If it did then the CRT wouldn't work either.
--------------------
Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.