I have the strangest problem. In all the years I have messed with computers I have never an electric shock. Well I had a couple of shocks of my old case and thought ooops. Not good perhaps it's dodgy power supply or touching board etc. Anyway I was not that concerned as I have another case and mobo to setup. I started weeks ago and today I was making things fit under the desk. I grabbed the new case handle and got a bèlt......so I was now getting concerned. I pulled out the power lead and turned the supply off and blow me I got another tingle as I was wary. So. I got the meter out and checked what was between the case and carpet and it seems to be 115 AC. I started pulling out cables one by one and it appears that it's when the USB cable to my OKI lazer printer that I get voltage on my PC case. If I pull the USB cable out of PC from the laser and measure the steel part to carpet I get 86 not the full 115. I am now about to try another USB and see what results I get but I have never experienced anything like this before. I dont have a clue what could have caused it.