Hi Truckergut,

Thanks for posting.  Apologies that your S2716DG is not performing as expected.

Here is information from the Dell knowledge base you may find helpful:

How to Use and Troubleshoot the Dell S2716DG Monitor

I hsve swapped to known working power cables and read the section you linked inregards to "no picture", and how to solve it. 

This unit doesnt even turn on from power button. I think its power components are dead.

Cant run any self diagnosis without it powering on 

If your monitor you purchased from Best Buy is still under warranty, you must register it into youur name, address, etc.

https://www.dell.com/support/article/sln143036

If there is no warranty, please contact the Dell Out of Warranty Department for further assistance.