I can't comment on the amplifier but as for the pc to tv question I may have some helpful input. More than likely the tv can't handle the signial directly from the nvidia's dvi output to the tv's hdmi input. check your tv manual and it will probably tell you that the input isn't compatible with a pc, mine does. Depending on which nvidia card you purchased it may include hdtv output via component cables, if not, return the card and get one that does. From what I've worked with it is the easiest way to get a decent quality picture from a PC to a projection tv.