Am picking up radio signals through my HDMI port?

I have created a "home theater" experience in my living room, and all was well until yesterday... I have an Epson 705HD projector hooked up to my MacBook Pro using the HDMI port. For audio I use a Y-cable to connect my computer to my Sony stereo receiver. This was a sweet setup and worked perfectly, but yesterday in the middle of watching a movie I started noticing a quiet (but noticable and annoying) radio signal coming through the stereo. Seems like this only happens when I have all the components plugged in together... Now I'm trying to troubleshoot which product is the root cause of the audio interference.
- I don't hear the radio signal when I have just my laptop plugged into the stereo (HDMI port isn't in use)
- I don't hear the radio signal when I everything plugged in except the stereo (I use headphones for audio, opposed to the stereo)
- I hear the radio signal when I touch the HDMI chord to the comporter's HDMI port when the stereo is plugged in
I want to blame everything on the Sony receiver since that's the cheapest thing to replace. Could it be the HDMI chord? Something broke in the projector? Perhaps my computer's HDMI port is messed up from too much plugging/unpluggin?
What's weird is this just started happening, never heard any static/radio noise before. Help/solutions would be greatly appreciated.

Reminds me of my grad school days in Rochester, NY, when vinyl was the source of all music. I had a decent stereo system for an impoverished student, but imagine my surprise when I learned, and not gently, that the phono cartridge in my turntable was perfectly attuned to receive the radio frequency used by the Rochester public transit bus dispatcher, whose signal was very strong indeed. I might be grooving along to Jefferson Starship, the Grateful Dead or Pink Floyd, gently ratlling the windows throughout our apartment and adjoining houses, puffing on a little of this or a little of that, when without warning I would be jolted out of my chair and across the room by an ear-shattering interjection of static-laden and distorted verbiage about the University Avenue local D bus, whose driver had just been vomited on my a drunk and needed advice about how to handle it. It was a real mood-spoiler for me. I replaced my phonograph cartridge and the problem was solved

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Reminds me of my grad school days in Rochester, NY, when vinyl was the source of all music. I had a decent stereo system for an impoverished student, but imagine my surprise when I learned, and not gently, that the phono cartridge in my turntable was perfectly attuned to receive the radio frequency used by the Rochester public transit bus dispatcher, whose signal was very strong indeed. I might be grooving along to Jefferson Starship, the Grateful Dead or Pink Floyd, gently ratlling the windows throughout our apartment and adjoining houses, puffing on a little of this or a little of that, when without warning I would be jolted out of my chair and across the room by an ear-shattering interjection of static-laden and distorted verbiage about the University Avenue local D bus, whose driver had just been vomited on my a drunk and needed advice about how to handle it. It was a real mood-spoiler for me. I replaced my phonograph cartridge and the problem was solved

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Am picking up radio signals through my HDMI port?

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