In device Manager what cause a wan dot near an exclamation sucker to appear surrounded by Communications (Port & LPT)?

The pale dot with exclamation is on the COM4

Answer:
Sounds approaching a driver issue, try installing/reinstalling the driver for the device.

Might also be an IRQ conflict.
a yellow dot next to an exclamation point means that the device is not functioning properly. First item to do is identify the part, and businessman. After that download new drivers for the cut and install them. www.driverguide.com has a yawning variety of drivers if the factory owner doesnt offer them (unlikely)
It money that the port is disabled.

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