OK so here's my issue I had some very quick warning about USB pop-up while on my computer, it was very quick and shut down my computer immediatly. Computer WOULD NOT statt back up...my first thought was PSU so I got a new one (EVGA 700B) the test kit it came with worked properly so I know it's not the new PCU after hooking everything up inside the computer will turn on...Here's my issue, as soon as I plug in anything USB or Monitor cable and at any acceptable port the computer shuts off, and it won't power on again unless I unplug whatever I had just plugged in. The only thing it will not do this to is the Ethernet cable.
This really looks like a PSU problem, so changing the power supply was a really good idea. Sadly, if the issue persists, I would advise you to check your motherboard. This is a serious port issue and may damage all connected devices. I would recommend you not to this risk and resolve the problem before using the PC again. You may need to seek assistance from a technician.