hey i just bought a xbox 360 pro 60 gb console and wen i was creating a profile i went in to settings and changed one of the tv settings from 480p to 1080p then the tv screen went black and i cant get no picture now and i also have a 1080p plasma HD tv so do i need a HDMI cable to play 1080p and what i was wondering is how do you delete or reset your memory/hard drive with out have a picture? send me back an answer please i really need the help