i want to play xbox, watch tv, and use my computer on my monitor im using my computer on it right now but i am going to get a cord so i can use xbox and put my cable box on it. it has an hdmi input on it and a dvi input. the hdmi is the screw in one not the usb looking one. i was going to get an hdmi to a vga but reviews said it doesnt work. so im going to get a dvi to hdmi so i can plug it into the xbox and switch it out for tv too. will this work and will it have sound.