I have a PS3 and it's pluged to my TV with an HDMI cable. My TV is a Philips 42PF9630A 42 in. Plasma Television. When I play most DVDs or Blurays, my screen will sometimes start flashing and then goes green and starts flickering. Ive noticed it's usually during the good parts of the movies lol, idk if it has abything to do with the sound increasing or image quality increasing or anything. I have the same problem when I play videogames too, but it's less common than with DVDs.