Akai LCT4216 42 in. LCD Television "scrambled squares flat screen tv" Questions

...scrambled squares in all 4 corners of screen display also scrambled and when i do get a pic thin white lines running across the screen seems when i turn it on and off several times i get some results ...

screen were the main reason for upgrading. Switched the same TV to analogue input and the problem disappeared. HELP! Is this lack of synchronisation of picture and sound integral to the way Digital is

...scrambled squares in all 4 corners of screen display also scrambled and when i do get a pic thin white lines running across the screen seems when i turn it on and off several times i get some results ...

...scrambled squares (1 in each corner ofscreen) when i try to use a hdmi channel.If i cut the unit off and switch to a non hd channel all is fine.Funny thing is it worked fine for a while. I havea cox ...