Causes and solutions of computer's failure to identify USB external devices
According to the above questioner's description, the computer can identify the USB flash drive, which proves that there is no problem with the USB port of the computer, and it should be the printer's problem. Then the detailed solution steps are as follows: first, connect the printer to the computer to see if the computer operating system has found "new hardware". If the system prompts to find new hardware, it means that the computer can recognize the printer, and then we will do the following operations.
When the operating system prompts you to find new hardware, you can then install the Printer Driver. I suggest that it is best to download the driver in the printer official website, and try not to use the third-party driver installation tool to run the printer driver installation program directly after downloading. After installing the driver, you can print normally.
So I just said, if the printer finds new hardware when connecting to the computer, it means that the computer can recognize the printer. If the system doesn't respond after connecting to the computer, it means that the computer doesn't recognize the printer. This problem is probably caused by a problem with the USB cable of the printer. I suggest replacing the USB cable of the printer first.
Summary: This question and answer explains the problem that the computer can't recognize the printer. I think there are two reasons for this problem: "printer USB cable" and "printer driver". You can solve this problem according to my idea!
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