5 minutes ago, Infensus said:
So I live in the UK (three pronged plugs) brown live, earth yellow and green, and blue neutral. Got lost a bit there. Anyway yeah I can see from the setup I have that not everything has a path to earth, because the interface is powered by the mac USB, it doesn't have it's own power source and everything is sat on wooden tables, no path to earth (I know nothing about electronics can you tell?) I will try moving some things around, and hopefully not get more zapped in the process. I assumed it was a fault with the gear, not the room... I'll report back if I manage to fix it
Yeah, building codes are different in different countries.
The Mac will be the source of the problem then, or anything else connected to the cluster of wires that is also connected to the wall. Thats the thing, case ground on pretty much every wire (USB, Audio, Video) traces back to earth ground when connecting anything to the wall.