I've never heard of this happening and I failed to find any similar incident over the course of several searches. Anyway, here's what I can tell you. I have two mining rigs in the same room as my LCD-TV. Just earlier today, I upgraded my TV service from basic to digital HD service. I added the HD cable service with the same company which has provided my 10Mbit cable internet for almost a decade now, without any incident I might add. So anyway, this morning I connected the digital HD box to the LCD-TV and everything has been working fine, until only a few minutes back when I fired up the second mining rig. Doing so instantly scrambled the television signal into total static. This only happens when turning on the second mining rig - the other rig has been running all day without incident, while the other rig I started up for the first time today only a few minutes back. The only thing that seems possibly relevant is the fact that the TV, digital box, and the meddlesome mining rig all share a power strip, while the mining rig that has been going all day without incident is on its own power strip (along with monitor, speakers, and an ethernet switch) from a completely different outlet. The problematic rig runs headless, so it's the only other thing plugged into the strip besides the TV and cable tuner. The only other relevant information that I can think to add right now would be that the problematic mining box is running two 5830 cards, while the trouble-free rig runs two 5970s.
This seemed really strange to me. I hope someone familiar with this type of issue can point me in the right direction. I haven't tried any troubleshooting yet in the hopes that I can find the solution on the net. I thank you in advance for taking the time to read this.