i just finished building a htpc and for some reason i cant get video output through hdmi. the tv im using is a Samsung PN42A450. when i try to connect through hdmi it will either flicker red while its booting up or the screen will stay black and eventually tell me no signal has been found. i thought this was an hdmi problem on my tv's end but all my other components work fine with hdmi. is there a setting i should be using on the video card so that it will accept the hdmi signal?