Could be wiring, but has no bearing. Measure from a corner every 16 inches. There should be a stud at these intervals, on center. Tap the wall at those points and tap elswhere. You should hear a solid sound on the studs.
i hear of a famous red barn in michigan somewhere. try famousredbarn.com from googles search engine
A British company called Alphason Designs sells an LCD TV mount in their Aragon series. This LCD support, called the AG54/2-LCD, comes with adjustable shelves that will fit most components such as DVD players. Here is a link: I hope this helps!