I have a rather interesting problem. I built my desktop about 8 years ago. I've made a few upgrades and it is actually still a pretty decent gaming computer. We've been through a lot together but I've never had a problem like this. I have a rather large desk and some of my devices don't reach the computer so I bought a USB hub with a USB extension cable. As soon as I plugged it in my internet stopped working. I use a usb wireless adapter. After some quick tests I determined that the hub is some how causing the wifi adapter to turn off. Is it possible that the hub draws too much power away from the other ports? I'm not really sure how to fix this.