It is displayed as a question mark in the device manager, indicating that the corresponding driver is not installed, and it is displayed as an exclamation point, indicating that there is something wrong with the driver or that the program conflicts with the driver. The solution is to check whether you have installed any software recently or deleted anything. If it is newly installed software, uninstall it first to see if there is any problem; If you delete any files, you must uninstall all drivers in this adapter and then reinstall them.