AS500 Display not working, Sound Bar is working

Hello - I'm having trouble with an AS500 monitor. It's part of a dual-display that has been working properly for about a year now. As of today, the monitor screen is not working. The sound bar is still working perfectly, but power does not seem to be getting to the monitor; as the power light is not lit. However, the extended desktop still appears to recognize that the monitor is there, as certain windows were opening on that part of the screen. If anyone has any idea as to what might be causing this, I'd appreciate some advisement. Thanks!