.... leading on from my last post. I've just found a USB Isolator on ebay, so you wouldn't need to hack the cable.. Olimex USB-ISO usb 1000V isolator full speed for development and audio hifi dac http://www.ebay.co.uk/itm/Olimex-USB-ISO-usb-1000V-isolator-full-speed-for-development-and-audio-hifi-da...

Hi, I've read this thread with interest, and joined up to post this comment which I hope will help. You may have heightened sensitivity to 'dirty power', which is what most cheap transformers kick out these days. This type of electric current has a lot of high frequency in it. I have an idea that ma...