Press the Command+Option+Esc keys to close any applications that may not be responsive.Restart your Mac and immediately press Command+Option+P+R until the Apple logo emerges.You can reset the ports by following these steps: There may be a problem with your Mac’s ports if you can use your USB on a different device but not on the one you’re using. This ensures that if you do connect your USB, it will show up on your desktop.In the Finder Preferences screen, ensure that “External disks” is checked.Go to Finder, then select Preferences and navigate to General.Follow these steps to ensure that your Mac displays these icons and fix the “USB Not Detected” error: You may have accidentally changed some settings where your Finder doesn’t show your USB icon even though it’s connected. If you see that the USB works on the other device, you can deduce that it’s an issue with your Mac and not the USB. If each port still doesn’t work, then try connecting your USB on another Mac or PC if you have one. If that doesn’t work, try it in every port on your Mac. First of all, try to reconnect the USB into the same USB port. Method 1: Retry the connectionĮven computers can be weird and make mistakes. We’ll list the seven most common solutions Mac users can implement when facing the USB not detected error. If your Mac can’t find your USB, it could have any variety of compatibility issues. Other reasons include:ħ Solutions on how to fix the “USB not detected” error If you don’t get a notification, it means you may not have fully connected the device or there’s something blocking it or the Mac can’t scan it. Usually when you connect an external drive, you receive a notification on your Mac’s Finder that you’ve connected a new device. Why you receive the USB not detected error 7 Solutions on how to fix the “USB not detected” error.Why you receive the USB not detected error.

Mac not detecting usb device