I have made 2 calls for support and both times after 8 minutes they hung up on me.  This is the worst customer service I have had to deal with.  I'm trying to replace a 20 inch Dell monitor with this one and having no luck.  I have trying run the Display port cord to monitor from AMD radeon Graphics card and it doesn't recognize set up.  I then run it via USB set up and it still doesn't see it.  I finally set it up via HDMI and it sees it.   Why won't it see the Display port set up or the USB set up.