That link does not work. You need to use the link buttons (the globe and chain link icon) to enter the link or provide the exact model number of the monitor so we can check out the monitor manual - which is where I suggest you look too.
What shows you don't have a digital signal on the output of the monitor? How do you know audio is being sent to the monitor via HDMI? Note HDMI is not a native computer technology and often only carries the video.