have tried unsuccessfully to get into 720 or 1080 from the screen menu on the 6412 through component input 2 or 3...only the 480i or p syncs upon input 1..the others go to a scrambled signal and I have to reattach the composite cables to the first input (480 only) to be able to even see the screen setup when the comcast box is off...anyone experienced this?? voom still working on component input 3