Did it come with drivers for it? If so, have you installed them? You could also go to the manufacturers website and download and install the latest drivers for your monitor (I was unable to find your particular monitor on Dell.com....and couldn't find anything on it on the web
You could also try it without the drivers to see if that's the problem. Go through the settings on the monitor itself to see if there's a standby mode that needs to be deactivated.
If the monitor is under warranty, I'd call Dell support for some options, to include an RMA.
War produces veterans, wounded both physically and mentally. They have sacrificed for us.....and it is now our job to help these veterans, as they have already helped us in ways we will never know, in ways that we cannot fathom, and in ways that we take granted every day.