You plug the printer in and nothing happens: no setup notification, no printer in the list, or a message that the USB device was not recognized. When the simplest kind of connection fails, the cause is usually physical or driver related, such as a worn cable, a hub that can't keep up, a port that powers down or a driver that never installed. This guide checks the hardware first, then Device Manager, power settings, drivers and the Mac's accessory prompt.
What you might be seeing
- Windows shows USB device not recognized when you connect the printer
- The printer appears as Unknown device in Device Manager
- Nothing happens at all when the cable is plugged in
- The printer is detected, then disappears after a few minutes
Common causes
- Cable or port problem
- A damaged, overly long or loose cable, or a faulty port, stops the computer reading the printer's identity.
- Hub, dock or adapter
- Hubs, docking stations and chains of adapters can drop the connection.
- USB power saving
- Windows may switch off idle USB ports, and some printers don't wake them again.
- Missing or broken driver
- The driver never installed properly, so Windows sees hardware it can't use.
- Accessory approval on a Mac
- Recent Mac laptops ask before a new USB accessory may connect, and a dismissed prompt blocks it.
How to fix it, step by step
Work through these in order and test a print after each one. Most people are done within the first few steps.
Never push a USB connector in at an angle or force it the wrong way up. Bent pins inside the printer's port are an expensive repair.
Reseat the cable and try another port
With the printer on and idle, unplug the USB cable at both ends and check the connectors for bent pins or debris. Plug it straight into the computer rather than a hub, keyboard or monitor. On a desktop, use a rear port, which is wired directly to the motherboard. Listen for the Windows connect sound or watch for a setup notification.
Swap the cable
Printer cables wear out at the square USB-B end, and cheap or very long cables cause intermittent faults. Use one no longer than about 3 meters (10 feet), ideally a cable that has worked with another device. On a laptop with only USB-C ports, use a single USB-C to USB-B cable rather than stacked adapters. If a new cable fixes it, you're done.
Reset the device in Device Manager
Right-click Start and select Device Manager. With the printer connected, check Print queues, Other devices and Universal Serial Bus controllers. A yellow warning icon or an Unknown device entry means Windows sees the hardware but can't use it. Right-click that entry, choose Uninstall device, then select Action › Scan for hardware changes so Windows detects the printer afresh.
Stop Windows switching off the USB port
In Device Manager, expand Universal Serial Bus controllers, open each USB Root Hub and, where a Power Management tab exists, clear Allow the computer to turn off this device to save power. If your power plan lists it, also set USB selective suspend setting to Disabled under Control Panel › Power Options › Change plan settings › Change advanced power settings › USB settings. This mainly helps printers that vanish after sitting idle.
Install the driver from an official source
Many printers install automatically through Windows Update. If yours doesn't, open Settings › Windows Update › Advanced options › Optional updates in Windows 11, or Settings › Update & Security › Windows Update › View optional updates in Windows 10, and install any printer driver listed. Otherwise use the full package from the manufacturer's official website, and connect the cable only when its installer tells you to.
Approve the accessory on a Mac
Recent Mac laptops ask whether a new USB accessory may connect. If you missed the prompt, unplug the cable, unlock the Mac, reconnect and select Allow. The rule lives in System Settings › Privacy & Security under Allow accessories to connect. Then open System Settings › Printers & Scanners, select Add Printer, Scanner, or Fax and choose the printer on the Default tab.
Test with another computer
Connect the printer to a second computer with the same cable. If it's recognized there, the first computer's ports, drivers or settings are at fault, so install its pending system updates and check its USB ports with another device. If the second computer fails as well, the printer's USB port or main board may be faulty, though the printer can often still work over Wi-Fi or Ethernet.
How to keep it from happening again
- Use a short, good-quality USB cable that isn't pulled taut
- Connect directly to the computer rather than through a hub
- Install optional driver updates from Windows Update
- Leave the cable connected instead of unplugging it every day
Common questions
Do I need to install a driver before plugging in a USB printer?
It depends on the model. Windows and macOS include built-in drivers that work with many printers as soon as the cable is connected. Some multifunction models need the manufacturer's package first, and its installer tells you exactly when to connect the cable. The printed setup guide says which applies to yours.
Can I use a USB hub for my printer?
A powered hub with its own adapter usually works, but unpowered hubs and laptop docks often cause dropouts and recognition failures. While troubleshooting, connect directly to the computer. Once the printer works that way, you can try the hub again and see whether the fault returns.
What kind of USB cable does a printer use?
Most printers have a square USB-B port and need a USB-A to USB-B cable, sold as a standard printer cable. For computers with only USB-C ports, a single USB-C to USB-B cable is more dependable than an adapter plus an old cable. A few compact printers use a USB-C port instead.
This guide is general information written for common home and office printers. Menus and button names vary between models, so check your printer’s manual where a step differs. Printer Problems Solved is independent and not affiliated with any printer manufacturer. See our disclaimer.