Television and Home Theater

Can I reset a 3 inch black strip around a 52 inch big screen zenith Looks like widescreen but it is not

Hi Techlore Community - first time I have joined a "chat" site

I have bought a 46" Sharp Lc46XD1E which via a good quality gold plated scart lead I have linked to my Harmon Kardon DVD 20 player.

Watching DVDs is spoiled as my picture seems to readjust itself every couple of minutes so the picture seems wonky during these momnets. Picture basically looks as if it is stretching itself, then contracting, before going back to normal viewing screen.

Should say picture was fine in my previous tv - though not flat screen. 

i have a mitsubishi 60 inch tv that i am having problems with hopefully someone can help me with. it turns on and has sound and even will display a picture for a moment then a large black square appears in the middle of the screen and then squiggly lines appear throughout the picture. I know squiggly lines is not a very technical term but once again, not an expert. anyone have any ideas on what may be wrong or how to fix?