Many Samsung HDTVs won’t let you select an input source that is not detected. This has caused problems for Samsung customers trying to connect their PCs to their TVs using VGA cables. This is particularly true for Sony PCs. In this video I will show you how to trick your Samsung HDTV into thinking that a PC is connected. For additional information please visit the PCTVCables.com blog.
Go here to read the rest:
Solving the Samsung HDTV "PC Input is greyed out" Problem