Preflight Fail: GPS Reciever Missing

Hi,

I have a Pixhawk with M8N GPS module but it's not detected.  I've tried the latest firmware on both QGroundControl and APM Planner but neither detect the GPS module.  The GPS port is providing ~5v so the module is getting power and all the connections on the GPS look good with no damaged cable.

Any ideas?

Thanks, Tim

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