By the sound of it, I think your unit will need servicing. But just so you know, if you want Samsung support, I support US products and customers. And from what I can tell, this model is for Mexico. (Correct me if I'm wrong.) So while I can't help you directly, if you want Samsung help, here's the Samsung Mexico portal for support on that product: http://www.samsung.com/mx/support/model/PL42B430P2DXZX
I have a Samsung PL42B430P2D plasma TV and have serious issues regarding connectivity.
1) PS3 doe not show output at all through HDMI, component output however is normal in both video and sound.
2) PC connectivity through HDMI does not show any output at all.
3) Direct TV HD DOES show video output but NO SOUND AT ALL.
HELP PLEASE, I have not had this kind of issue with any TV, it is usually plug and play.