My Screen Just Went Black and None of the Equipment is Responding!

When this issue has come up in the past, it's been Point of Sale units being shuffled around in the work area and cables being loosened up from where they've been plugged into. Ideally, you don't want to have cables stretched to their limit anyway, because besides knocking cables loose, strain on cables will break down wires inside and cause premature failure of the cable over time, so avoid that situation where possible.

You can check to make sure your PC still has power. The power lights aren't overly prominent on these, but they can be seen if you look through the vents or at the top panel. Your particular unit may differ slightly from what's pictured.

 

reseat power cable if loose