Ginette 0 Newbie Poster

Hi, I have a Benq FP547 monitor that has been working beautifully for several years. A few days ago, it started going black with the message No signal. Yet the cpu is working and all connections are good. Sometimes it will light up and work fine, as now. Other times it will turn black in the middle of use. Example, this afternoon, I was watching a video and when the screen went black, I could still hear the video running. When the screen does work, it looks great... What could it be and can it be repaired? I don't want to spend money for nothing... Thanks for any help.