One by one the usb ports stopped working. The computer has two ports in the front and two in the back. First one in the front where I plug in a microphone stopped recognizing the mic. Then the other would not recognize it after a while. My printer is connected to one of the ports in the back and I got an error message saying there is no communication to the printer. I switched the port where it was plugged in and still no communication. I've unplugged power cords, restarted, restored to a date when I know it worked and still no ports work. I even tried to ad new hardware but nothing seems to be recognized thru usb ports.