During hardware self-test, the 550A UART device located at the first set of hardware I/O ports failed its loop-back test. ...

During hardware self-test, the 550A UART device located at the first set of hardware I/O ports failed its loop-back test.   If any new hardware has been added to the system recently, then it is likely that the new hardware is conflicting with this device.  Otherwise, it is possible that this device has been set incorrectly in the Device Manager.
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