Common to see when you first open the Qest4 software. It should automatically find a port and connect within a few seconds. If you have waited a couple minutes and it still is not connected, below are some things you can check.
Check the basics:
General System checks:
Hardwire - USB System (additional checks):
Bluetooth System (additional checks):
If these steps fail to resolve the problem:
There is an outside chance of a hardware failure. Before concluding this is the case, please test the unit on at least 2 computers.