Help with Mathematica: Solving Equations of Equilibrium

[blown91]

I am doing a force analysis project on a front end loader. I have set up equations of equilibrium on all of the links and tried to solve using the built in Solve[] function in Mathematica. The only thing it will return is {}, what does this mean? There is no reference to it in the help guide. Any help is appreciated, thanks

 

[FredGarvin]

A return of {} means there is no possible solution to the equation.