I am new to this site and just getting my feet wet in the computer world. I have a Dell dimension 9100 which completelty stopped working couldn't even turn it on out of the blue. After much investigation I found out how to jump start it with a paper clip. Then it turned on but USB ports were now dead. I grabbed a buddies ps/2 keyboard was able to boot it up and save essential data on an external. I then reformatted it with windows xp. Finally everything seemed to be in order reinstalled some drives for video card ect upgraded bios. Then after a day or so the usb ports starting acting up. They come In and out of working. Sometimes you'd see the lite from mouse and still wouldn't work sometimes nothing at all. Now I'm back to square 1. All 7 USB ports 2 in front and 5 In back are out of order. Any help would be greeatly appreciated. Thnxs