New Dell XPS computer would not support an HDMI monitor. Got a new Dell monitor. Got new Dell cables. New monitor will not connect to new Dell XPS computer. Finally gave up and returned the whole mess. My 11 year old Dell XPS Win7 machine is still chugging away with only very minor difficulties. I think I'll just live with it a while longer. 
I just purchased my second Dell desktop computer. The old one was 11 years old, still works great and is only being replaced because Win7 has become problematic and the machine is not compatible with the newer OS and software. I have to say that this new purchase has been the most difficult and complicate purchasing experience in my life. By comparison, signing up for new cell phone service now looks amazingly simple. Buying a new car will now be a piece of cake. Buying a Dell computer, on the phone, and getting it to set up correctly has so far taken more than a couple of phone calls, each lasting more than two hours, with multiple transfers between departments and everyone working off scripts that they have to read out loud to me before we can move on the the next step. In the end I wound up having to buy additional Dell components, that did not need replacing, because of incompatibility issues with the new system that were never discussed at the time of purchase. Dell makes great computers, which is why I purchased a second one from them. It is unfortunate that they make buying experience horrific. 
Worse than buying a car