I'm having difficulty getting the picture quality up to scratch. I have Hitachi 42PD5200 and use the DVI-D connection. However the pcture is not as good as expected. There are several settings I'm not sure about however. Which of the 480p 576p, 720p and 1080i resolutions should I select using the DVI button on the remote? Also when I use the Avia setup disc the test that should show a circle shows an oval. I'm wondering whether to exchange for the 540D. I would be grateful for any help on this matter.