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USB PORTS WHEN A USB DEVICE IS CONNECTED TO THE USB PORTS THE COMPUTER SAYS UNKNOWN DEVICE IS CONNECETED

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Try a powered hub,if not, usb port may be damaged, very common problem! if it is desktop add a usb card.

Posted on Jun 13, 2008

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Posted on Jan 02, 2017

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The computer can not recognize drive (unknown USB device).


Method 1 - Unplug Computer So how did I finally fix the problem? Well, if you are lucky, it's a super simple solution! Try this method first and if it works, you'll have saved a lot of time.
Simply unplug your computer from the power supply. Yes that is it! Note that this does not mean just turning off your computer using the power button because most modern computers don't actually turn off completely and the motherboard will still get power. This is useful sometimes if you want to remotely wake up a computer, etc.
The motherboard is where all of hardware of the computer connects to, including the USB ports. Sometimes the motherboard needs to be "rebooted" because things can go wrong, i.e. all or some USB ports suddenly stop working. The small microprocessor on the motherboard will reload the drivers and your USB ports should hopefully be recognizing devices again.
So first turn off your computer using the Shut Down option in Windows or pressing the power button and then UNPLUG the PC from the wall outlet. Let it sit for several minutes and then plug it back in.
Method 2 - Update Device Driver If Windows is not able to recognize the device, you may also see in Device Manager that the device shows up as an "Unknown Device". You can get to Device Manager by clicking on Start and typing in devmgmt.msc or by going to Control Panel and clicking on Device Manager.
In that case, you should right-click on Unknown Device, click on Properties, then the Driver tab and then click Update Driver.

If this doesn't work, you can also try to download the driver for your device from the manufacturer's website. If the USB device is just a flash drive, then it's probably not a driver issue. However, if you are installing a USB printer, drawing pad, etc, then it might be worth downloading the driver for that specific device.

Method 3 - Restart & Disconnect USB Devices The next thing you can try is to disconnect all USB devices and then restart the machine. once you have restarted, try to connect the USB device that was causing the problem.
If that particular USB port doesn't recognize it, try another one. If the device is recognized by a different USB port, there could be a hardware problem with one of the USB ports. If no USB port recognizes the device, then keep reading because it's probably something else.

Method 4 - USB Root Hub Another thing you can try is to open Device Manager, expand USB Serial Bus Controllers, right-click on USB Root Hub and then click on Properties.
Click on the Power Management tab and uncheck the Allow the computer to turn off this device to save power box. If you have more than one USB Root Hub listed, you need to repeat these steps for each one.
Click OK and then restart your computer. Try to reconnect the USB device and see if it is recognized. If not, go back to the power management tab for each one and check the box again. If it does recognize the device, then leave them unchecked.

Method 5 - Connect Directly to PC A friend of mine ran into this issue and the cause ended up being his USB hub. He only had three USB ports on his computer, so he bought a hub where he could connect an additional 8 USB devices.
I guess this proved too much for his computer and it just started sporadically not recognizing various devices. After removing the hub and connecting the device directly to the computer, it worked just fine.
We haven't really been able to find any other solution to this problem other than reducing the number of items connected to the hub. Actually, one other solution worked, but it meant having to buy a new USB hub with more power.
If you are having this problem with Windows 8 or Windows 8.1, then you might be in luck. Microsoft has released a fix for Windows 8 not detecting USB devices properly. Make sure to install this hotfix if running Windows 8.
Method 6 - USB Troubleshooter If nothing has worked so far, you can download the Windows USB Troubleshooter Fixit tool. It's a free tool that works with Windows XP, Vista and 7.
You can either have the troubleshooter fix the problems for you or select the fixes yourself. I would just let it fix them for you since the choices can sometimes be confusing and technical for the novice user.
Method 7 - Update Generic USB Hub If you are getting the Unknown Device error in Device Manager, you can also try one other thing. Open Device Manager and then expand Universal Serial Bus Controllers.
You should see at least one item called Generic USB Hub. On some computers, you might see two, three or more of these. Right-click on the first one and choose Update Driver Software.
When the update dialog pops up, choose Browse my computer for driver software.
When the update dialog pops up, choose Browse my computer for driver software.

Jul 10, 2015 | Transcend StoreJet 25 750GB USB Hard Drive

1 Answer

I have a Craig mp4 .. but I'm trying to use it but i do not how .. because when i connect it to the computer it is not recognized by the computer please help me


Hi, Are you getting a "USB device not recognized" error whenever you plug in a USB mouse, keyboard, or other USB device? I love USB and have 5 ports on my computer so that I can connect my mouse, keyboard, camera, phone, and printer to it all at once!

However, last weekend, my computer stopped recognizing my USB devices! The strange thing about it was that the USB ports were not bad because all of my devices were still getting power to them. I could still charge my cell phone without a problem!

usb device not recognized

So I started with the normal fixing methods, including uninstalling the drivers for my devices and reinstalling them. That didn't work! Next I tried System Restore thinking that maybe I had installed something and it caused a conflict with the USB system drivers. That didn't work!

I read online that in order to fix this problem I should go to Device Manager and uninstall all of the devices under USB Controllers. Restarted the computer, reinstalled the USB drivers, but the problem STILL did not go away!

You may also see in Device Manager that the device shows up as an "Unknown Device".

unknown usb device

So how did I finally fix the problem? Well, apparently it's a super simple solution! No need to edit the registry, uninstall drivers, or anything of that sort.

Simply UNPLUG YOUR COMPUTER FROM THE POWER SUPPLY. Yes that's it! Note that this does not mean just turning off your computer because modern computers don't really turn off when you press the power button as the motherboard still gets power.

First to explain, the motherboard is where all of hardware of the computer is connected to, including the USB ports. Sometimes the motherboard needs to be "rebooted" also because something can go wrong, i.e. all your USB ports suddenly stop working. The small microprocessor on the motherboard will reload the drivers and your USB ports should be back to recognizing all devices!

So first turn off your computer using Shut Down or pressing the power button and then UNPLUG it from the wall outlet. Let it sit for about a minute and then plug it back in.

Hope this helps someone fix that pesky "USB device not recognized" Windows error!


Have a nice day...

Mar 02, 2011 | Audio Players & Recorders

1 Answer

Why the camera does'nt appear?


1. the USB port on your computer does not work -- try some other USB device (such as a USB memory-stick) in that slot, to see if any device in that slot is recognized

2. the camera does not work -- try connecting it to some other computer to check.

3. your computer is missing the device-drivers for the USB ports -- try some other USB device, and/or look in "Device Manager" for "unknown" device, or a yellow question-mark on some device.

4. you need to install the software from the CD-ROM that came with the camera.

Dec 15, 2010 | Logitech Webcam

1 Answer

Unknown walkman


Downloading and installing driver from the website wont help much on this issue. It usually happens with the faulty usb port on the MP3 player or on the machine. Try connecting to another USB port on the machine. Also please check if the USB port on the machine is working fine

Dec 16, 2009 | Sony NWZB133F MP3 Player

2 Answers

Cannot print from computer. printer will print test pages, though


How the printer is connected to PC Via USB or using Network Cable. If it is connected Netwrok cable than printer configuration page and on netwrok configuration there will be IP Address if this is valid IP Address than reinstall drivers and upgrade the Firmware of the printer.

If Printer is connected USB than try different USB Cable and try different USB Port on the computer
If USB port on the computer is working fine and check in Device Manager if the printer has detected as unknown device or not detected at all.
If detected as unknown device than reinstall printer driver if not detected at all than USB Port on the printer is faulty you need to set up hardware repair of the printer.

Oct 16, 2009 | HP Color LaserJet 3500 Printer

1 Answer

I-ball digital pen tablet - usb port - unknown device


i ball tablet comes with a driver cd.. uninstall your usb unknown device and install the driver..it should work properly..

else connect to internet and update your diriver..

as for 2000 the same procedure will work...


Jun 08, 2009 | Computers & Internet

1 Answer

Want to connet internet on pc via mobile set 66oo


with help of a bluetooth device you can connecet your pc with your nok.6600 mobile phone, because their is no usb port connection available in your mobile fone.
thanking you
rajiv kumar 9811461147

Mar 28, 2009 | Nokia 6600

1 Answer

Windows does not recognize USB connection to the SpeedStream 6520- malfanctioning


try using different USB port. if the it is unknown device. means the machine didn't recognized the device. you may have to install the device driver. (windows is a funny thing).

Nov 05, 2008 | Siemens SpeedStream Modem (4100) (SS4100)

2 Answers

USB adapter for Focus 7200


There is no "driver" for FK-7200, and the PS/2 connect can easily find an adapter to plug it into a USB port.

Jun 07, 2008 | Focus Electronic Focus FK 7200 PS...

2 Answers

USB device unknown


Make sure you are connecting directly to the computer's USB port, not through a hub. Try disconnecting other USB devices before plugging in the camera. Check the manufacturer's website for updaded drivers: if all else fails, a reinstall of the camera's drivers may be in order.

Mar 01, 2008 | Sanyo Xacti VCP-HD2 Camcorder

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