The port (or jack) for the USB cable is loose. On the PM3 and PM4, this is the largest port on the bottom of the monitor. On a PM5, this port is on the back of the monitor and is located directly beneath the race system jacks. For help identifying the USB cable port, use the hover overs on the How To Use page for the monitor you have: PM3 | PM4 | PM5
The USB cable port has broken off the circuit board. To resolve the issue, the PM must be replaced.