I have a Latitude Cpt V and the USB port on the back is loose. At first, the mouse would work all the time even though it was loose. Now, the mouse will only work if the cable is played around with until I have a connection. If the cable or laptop is moved, the connection will drop and I will get a message in Windows about an unrecognized USB device.  Is there a way to fix this or am I going to need a new system board?