That ranks up there with...
Client: Hi, the crestron system isn't working.
Us: What part of the crestron system isn't working? Can you control lights and thermostats and arm/disarm security?
Client: I cant control the DirecTV boxes but everything else seems to be working fine.
Us: Your system has 8 cable boxes.
Client: We switched to DirecTV.
Us: Did your crestron system stop working after the DirecTV installers left?
Or that the ____ is off. Try that Cable Power/BDP Power/etc Power button