You may have blown the fuse on the motherboard for the USB, you cannot replace as it's built in. you could try removing the USB in device manager and restart your computer and let windows reconfigure it when you restart comp. PS how did you try to connect your printer i.e. did windows ask for windows disc when you connected the printer. If so did you put the windows disc in, if you did that is the problem, you should have put the CD in you got with the printer.