A yellow exclamation point next to a device in Device Manager means that Windows has identified a problem of some kind with that device.
The yellow mark itself does not give any valuable information but what it does is to confirm that a Device Manager error code has been generated. To fix whatever problem is going on, you'll need to view this code and troubleshoot accordingly.
How to determine the error code generated
Double click the Unknown device as shown above, another box similar to the box shown below will appear. This will help in solving what the issues is . Click here to see the list of code that could be generated by the Device manager and there reason.
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