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Today I was on my computer, and I wanted to plug in an external battery powered speaker to my PC’s front audio jack using an AUX cable.

I noticed as soon as I plugged it in the familiar burning smell when something like a capacitor or resistor burns out, so I immediately unplugged everything and noticed that the AUX cable was very hot. After I had a poke around inside my computer, I couldn’t really see anything that looked damaged. After I had a go turning it on again, the audio still worked (through the rear jack) so it looks like it didn’t blow the sound part of my motherboard.

However, after doing some more investigating, I noticed I could feel a slight tingle on my computer case when touching the case and what I think is a grounded point in my house (touching the shielding of a coax cable coming out of my wall). After making sure my PC was plugged into a grounded socket, I still felt this sensation. Even weirder, when I unplugged the case, I still felt the sensation when touching the grounded point.

Could this mean there is something wrong with my ground and it always has some potential running through it?