I had one 110V circuit running four CPU (13v) devices (Laptop, Switching hub etc) and a completely separate 220v circuit running two CPU Servers (13v output 1,300W draw each). This set up had been running for two months as is no problems. Yesterday I added a third server to the 220v circuit and it ran flawlessly for an hour or so. Then ALL of it went down..... both the 110v and the 220v circuits. I checked and neither breaker had gone (I reset them anyway). I flipped the main breaker and no difference. I grabbed my wire tester and it lit up on both lines all the way to the devices yet NONE of the devices are working. No smoke, no bad smells no fire no nothing. Is there such an issue as a ground wire needing to be upgraded or some such thing that would allow pos juice to flow to an outlet yet not allow a device to power up? I'm not an electrician clearly if it needs to be said lol. Thanx very much for any input you may have.