A:Answerit all depends on the source.. but composite cables usually arent meant for HD and usually limited to 480 and does not support HD because your forcing the entire video signal down one wire.
A:AnswerIt comes with a power cord. If you are buying a used one and it does not have a power cord then you would have to install one. Just FYI, Often if the TV or other appliance is unsafe The repair shop may cut the cord off to protect others.