My HTPC is making a horrible high pitched whining noise that is just on the limits of my hearing ( my wife can't hear it but to me its very loud). It seems to emanate from the radeon 9800 128M in the machine (arctic cooler on it so its not a fan problem) I've ruled out other sources of noise ( silenx PSU , x2 zalman 80mms and silenx on the front intake none of which are making objectionable noise). Thing is if I do certain things that produce a graphical response ie: adjust the custom aspect ratios in Theatertek the noise will die whilst I'm zooming up the picture in this case) Has anyone ever heard of this before? Its a bit like the noise from a CRT but more noticable. Capacitors going bad on the card or something? I'm using a gyration ultra suite ( wireless mouse and keyboard into a USB port). The only other device hooked up is a USB external HD which is often powered down as its for hidef storage only) I have a radeon 9800XT in my other machine that I can swap over for comparisson (its watercooled though and it will be a right pain to unbolt the block and put the fan back on it).