Question about Dell UltraSharp U3223QE

Hello everyone, this monitor has worked great so far. It is connected to a MacMini and occasionally to a MacBook Pro. Since yesterday I can no longer see a picture on the monitor, it gets power but the picture remains black. The menu doesn't appear either, so I can't reset the monitor to the factory settings. I have unplugged all the cables, replaced them and tried using USB C instead of HDMI. Is this a case for repair?