Was this one of those models that use the 120 Watt power bricks that they use for Laptops? I remember old AIO's not XPS ones that were like that. Most of them eventually died.

The Dell XPS 27 Touch All-in-One (2720) all-in-one desktop updates the best Windows 8 PC around with Intel's latest hardware, and comes up a winner. 4.5 Excellent by Brian Westover Jul 24, 2013 4. ...

The XPS One 27 is packed with the best gear in just about every hardware category. As its name implies, it sports a 27-inch display that serves up 2560x1440 resolution.