Problem: Your Mac can’t see your printed connected by a USB cable. You know this because you’ve already plugged the USB cable into your Mac and printer, turned your printer on, and tried to add the printer via the Print & Scan system preference. When you press the “Plus” button in the system preference, your printer does appear in the “Default” tab of the “Add Printer” window. What can you do?
Solution: Step #1 is to make sure your printer is turned on. There’s no way to print if there’s no juice flowing through that plastic box next to your Mac. Once on, here are a few steps you can take to make sure your Mac can see your printer.
Click the plus button in the Print & Scan system preference to open the “Add Printer” window. (If necessary, select “Add Other Printer or Scanner.”)
Connect the printer directly to your Mac rather than a USB hub and turn the printer on.
Open System Information from your /Applications/Utilities folder. Click on “USB” in the Hardware section of the Contents pane. Check each USB bus to see if the printer is listed as a connected device.
If your printer does not appear on any USB bus, you can try plugging the printer into another USB port, changing the USB cable, or turning the printer off and on. If System Information still cannot see your printer, you may have a defective printer (one way to test this is to see if another computer can recognize the printer).
Did this tip work for you? What else have you done to make sure your Mac can see your printer connected via USB?