What’s USB?

USB, short for Universal Serial Bus, was invented to standardize the connection of many peripherals: keyboards, pointing devices, digital cameras, printers, portable media players, disk drives and network adapters.

Almost everyone now has two types of USB:

  1. USB 2.0
  2. USB 3.0

USB type 3.0 provides better speed and more efficient power management than USB 2.0. However, sometimes you can’t differentiate between those two versions of USB. Here’s a couple of hints to know whether your USB is 2.0 or 3.0:

Check the logo

Since USB 3.0 is also knows as SuperSpeed USB, you can easily find the SS mark around your USB port.

Check the color

Most of the time but not always, the USB 3.0 port should have blue color inside the port (even if it doesn’t have the SS mark) whereas USB 2.0 has either black or white inside the port.

USB device not recognized

Sometimes when you plug in a USB device, an error message appear saying that:

USB device not recognized, the last USB device you connected to this computer malfunctioned, and Windows does not recognize it.

As the message says, the USB can be damaged or Windows may not be recognizing it. So, let’s begin our solution to this problem.

I- First of all, make sure it’s not a hardware issue

Try your USB device on another computer, if the same message appears then it’s more likely that your USB device is corrupted or damaged, that’s why it’s unable to function.

If it works when connected to a different computer, then it’s a software issue and you should follow the next steps to solve it.

II- Remove all other USB devices and USB hubs

If a certain device isn’t recognized, it’s better to remove any other USB devices. Also USB hubs are not very good at transferring data of multiple devices at once.Image result for usb hub

III- Now, turn off your computer completely

Yes, it’s really the solution to many of the users. And by completely I mean shut down your computer and unplug any power source for 10 minutes minimum.

  • If it’s a PC, shut down your computer and unplug your power cable.
  • If it’s a laptop, shut it down, unplug your power cord and remove your battery.

IV- Update your USB drivers and fix Root Hub

  • Type “device manager” in your start menu and the select Device manager.
  • Expand Universal Serial Bus controllers, right-click on USB Root Hub and select Properties.
  • In the Power Management tab, uncheck “Allow the computer to turn off this device to save power” and then click OK.
  • In the Driver tab, click “Update Driver“.
  • Choose “Search automatically for update driver software“.
  • Apply the previous steps to all USB Root Hubs.
  • Restart your computer.

V- If updating the drivers didn’t work, uninstall them

  • In the device manager, right click on your USB Root Hub devices and choose Uninstall device.
  • Click Uninstall.
  • Apply the previous steps to all USB Root Hubs.
  • Restart your computer, the drivers will automatically be reinstalled.

VI- Change some power options

  • Open “control panel” and search for “power options” and choose Power Options.
  • From the left pane, choose “Choose what the power button does
  • Choose “Change settings that are currently unavailable”.
  • Uncheck “Turn on fast startup” and then select “Save changes”.
  • Go back to Power Options.
  • For the current plan, select “Change plan settings”.
  • Select “Changed advanced power settings”.
  • Expand “USB settings”.
  • Expand “USB selective suspend setting”.
  • In both “On Battery” and “Plugged in” select “Disabled“.
  • Click “Apply” and then “Okay”.
  • Restart your computer.
Was this helpful? Vote on this article!

Still stuck? Ask your question in our forum!

About Author


Mina studies communications and electronics engineering and works as a technical support. He keeps himself up to date with the latest developments and news in technology. He loves helping people with their daily tech issues, so he's always ready to go the extra mile.


  1. Avatar

    Nice post but did not fix the problem. Other USB devices are working, one particular HP P1700 printer is not working. Where as its working on all other computer

    • Avatar

      Hello Ashish, printers have more problems than regular USB devices. I would suggest that you remove the printer from your devices list, then try to re-install the driver and finally add the printer one more time. Also, try to use a USB 2.0 port if available. Also, if you’re using a different cable on this computer, try to use another one that worked with other computers.

    • Avatar
      Mina Magued Mounir on

      Hello John, you mean a cut cable? Yes sure the computer will never recognize it, that’s why if a cable has a cut inside it or damaged, there will be an open circuit and the computer won’t recognize it.

  2. Avatar
    Asus Error Code 55 on

    Thanks for sharing such useful information. You have guided here very nicely. Thanks for sharing such rare ideas. Hope we will get more useful ideas in the future also.

Leave A Reply