Hello everyone i m new here and this is my first post.i just got myself a SONY BRAVIA 40EX650 LED TV.i want to connect it as a monitor for my desktop and the hi-fi sony audio system which i am already using with my desktop as an audio output device.do i have to buy HDMI cable (not supplied with TV)?if yes i do not know whether my PC supports HDMI or not or should i buy VGA cable and connect my CPU with the TV?third option is (i read it in the TV manual) a D-sub 15(no idea what it is) cable?please help any solution is appreciated.thanks