OK this is about the 2 settings, TV and HDTV, i have just noticed my TV has HDTV, i havent tried it yet since i just figured this out and im too lazy to play... lol

i do have 2 questions

1. Does HDTV really increase graphics value? i mean ive seen one play on HDTV and one on TV but different games, so im not sure if one just had better graphics

and

2. if so does HDTV only affect how good the 360 games graphics? like if it can improve the graphics of DOA4, can it improve the graphics of something like HALO that is for the regular xbox

Every Xbox 360 gameis running in 720p standard resolution so games like DOA4 graphics will improve. If a original Xbox game supports 720p or 480i then it can be seen on those resolutions on the 360.