system
Given the following post, respond as if you're commenting on Reddit:
human
Why does the ticking of my clock mess with the display on my TV?

I have an analog clock hanging on the wall about 4 feet away from my LCD HDTV. My TV is connected to my laptop via HDMI when I use it, as I don't have cable. If I don't have a video or music playing on the TV (i.e. if I just have Facebook open), there is interference on the display of the TV in time with the ticking of the clock. The interference kind of reminds me of the horizontal lines that used to happen when you played a VHS tape. What is causing this interference? Thanks!
gpt
Battery powered clock?   Usually those use a pulsed electromagnet to advance the gearing once per second.  They create a small "EMP" electromagnetic pulse.   Tune an AM radio between stations, and it may pick up the one-second pulse as a click sound.

But this shouldn't affect your TV unless it has a poorly shielded (bad) video cable.