Hi guys, it's me again with a bunch of questions. A few days ago my power supply unit crashed, so I had to replace it. It works perfectly fine, but it has a light grey wire consisting of black, red and white smaller wires and it has a four-pin end, which doesnt seem to go anywhere (my old psu did not have this wire). It is my first contact with this kind of hardware and i am pretty puzzled about this. After the death of the old psu my computer decided not to recognize devices in my usb ports. And as I have an external sound card it is a pain in my neck. The computer does show that there are usb root hubs and says they are working properly. My mouse has a red light and it is blinking as it should be, when i try to connect my mobile to the pc it shows like it is working, but no sign of the *kraft g* on *my computer*. Also, it does not show that my generic usb device as the sound card is connected. To sum up, I looked up about my connected usb devices and it showed the history and also said none of them are connected atm. If you managed to read this awfully written piece (English obviously is not my native language and i am kind of in rage here) and understand the problems, here are the questions 1. What does this wire described in the first paragraph do? 2. Is it possible that some kind of virus/psu crashing disabled the usb ports somehow? How can I get my usb ports to work?