I've been using my Silicondust HDHR for a little over a year with no problems (1 tuner for clear QAM and 1 tuner for ATSC). I forgot about my ATI 650 tuner I had sitting so I added it back in to my PC so I can record analog cable channels. Now with the ATI card in I get a high pitched whine on analog channels both live and recorded content. Any digital channels (HD and SD) are fine with no high pitch whine. Desktop sounds, listening to MP3s, games, etc. are all fine. Audio is onboard audio connected to receiver via coax cable. No toslink out on the computer to test. I also tried the standard 1/8 connector on the PC with a stereo RCA adapter into my receiver and I still only get the whine on analog cable. I've tried re-seating the ATI card into different slots and nothing changed. Any suggestions? Thanks in advance for any help!