So I know I've been posting a lot about my learning experiences related to getting a new TV... I am *so* close to having everything set up the way that I want, but I am coming up short at the very last step. There are many places where this setup is not ideal, and I recognize that completely. I'm totally happy to hear suggestions involving investing in new hardware, although at this point, I am primarily focused on getting this working without major new investments. The basic problem is that I'm experiencing a hiss/buzz (sounds like the kind I'd expect from a grounding problem or an impedance mismatch -- a constant buzzing sound that *is* dependent on the volume setting of the stereo) when I hook both my television and my computer to my stereo. This is the setup: Sources: - ReplayTV DVR -> connects to the TV via component video + RCA analog stereo audio - DVD Player -> connects to the TV via component video + RCA analog stereo audio - VCR -> connects to the TV via composite video + RCA analog stereo audio - iMac G5 -> connects to the TV via VGA -> I have a long 3.5mm audio cable (headphone jack to headphone jack) that goes from the iMac to a Y-splitter. Right now, 1/2 signal goes to the receiver (3.5mm -> RCA cable) and the other half is unplugged, although intended to go to the TV via 3.5mm cable - LCD TV (as a pass-through of audio signals only) -> 3.5mm to dual RCA cable to the receiver -- the TV passes audio through on this port from whatever source is cued. Destinations: - LCD TV (Insignia NS-32LCD) - Receiver (an old but nice pre-5.1 Technics receiver with floorstanding speakers) Now, here's the problem. Everything works except the audio connections to the receiver. If the TV is totally unplugged from the receiver, then the iMac through the y-splitter works fine. I ruled out an impedance mismatch at the Y-splitter because plugging a cable or headphones to the other port does not cause a problem. However, if the iMac goes to the receiver and the TV goes to the receiver, even though the iMac does not go to the TV, I get a constant buzz on the iMac's receiver channel, just by virtue of the TV being plugged into the receiver. So the connections I don't have right now are iMac -> TV and TV -> receiver. As far as I know, I can do iMac -> TV without messing anything else up (I just misplaced a cable ). But as far as I can tell, I *cannot* do TV to receiver without messing everything up. I know this is long... but can anyone refresh my (minimal) electrical engineering education? Is there an obvious reason why this is not working and cannot work? Is there a grounding fault somewhere I can potentially remediate? Any help would be soooo appreciated!