On: Why is there a voltage on my HDMI and coaxial cabl...

[HeavyFeather]

> it doesn't seem to happen if I press hard

I would assume that's because you're increasing the contact area and therefore more of your nerve endings are getting a lower voltage, pushing it below the detectable range.

[lolc → HeavyFeather]

In my case it's not just nerves that feel it. I can get my fingers to vibrate at presumedly 50 hz by stroking the laptop lid. There is an audible hum.

It happens with just one charger I have. The other charger just went out with a bang that tripped the fuse. So guess which one I use now.