blocks in the blacks?

[admin_exported]

hi ive got a 37in panasonic plasma and sky hd,its got all the best cables etc but when watching films on sky hd channels when the screen goes dark eg in caves etc.. the picture goes really blocky shades in the blacks anyone know why and how i can correct it? thanks darren

 

[Anonymous]

Hi, What picture setting do you have it on. "Cinema" mode is the best one to start with for movies.