I am trying to connect my U2913WM monitor to my desktop at home (had to move everything home from the office because of COVID). I have used the monitor at the office for several years and love the wide display. I connected the VGA cable and got the error message "no mini DisplayPort cable, will go to power saver mode in 5 minutes.". I connect the USB cable to the desktop, but there isn't a port on my Inspiron for the HDMI cable (at the office the monitor was connected to the desktop with the HDMI and USB cables).
Update 3:11PM = I got it to work. It turns out that the monitor didn't have an HDMI to HDMI cable. It was close but it had one square side (it was a DP to mDP cable). Anyway, I figured out how to change the Input Source from DP to VGA, so I am all set!