One thing I noticed on my ps3 was that if you use one type of connection, example, a/v cables, it seems to work a little better if you stay on that connection, then reset it and move it over. So hook it up to your 42" via av cables, then switch the options in the ps3 panel, the screen you need is display settings. So tell it t run everything via hdmi, also try using 720p if you can instead of 1080p. It may be the ps3 wants to run in 1080p and the rca tv only does 720? Just a thought. Once you save your settings, then you will just need to swap your input signal on your tv set and verify it works.