Question about IBM ThinkPad T21 2647 Notebook

1 Answer

IBM T21 usb issue

When any usb device is plugged in I have an error USB Device Not recognized and my device manager reports unknown device please advise

Posted by on

  • brussells Apr 06, 2008

    the OS is windows XP sorry, but fault has been resolved by replacing the usb/video/parallel/serial/AC/nic/modem ports pcb





    Thank you




  • ttruex62 Feb 11, 2009

    Running Win 2k, same issue- plug in a mem key, it pulls up an unknown device, then tries to install the driver, only to kicj it out as unrecognized. USB no worky at all.

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that hasĀ over 10 points.

    Mayor:

    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 55 Answers

U have to install drivers for usb connections.
i guess u have 98 version of windows. if u have windows 98 operating system u have to have install drivers for every USB devices.

feel free to ask me questions regarding this answer
chirag

Posted on Apr 04, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

My Windows 7 cannot recognize my Sata/usb connector


USB hard drive is a portable external storage device that works just like a conventional hard drive. The device is simply plugged into a USB port on your computer as you would connect a flash drive. Unlike a flash drive, however, a USB hard drive can store a much larger amount of data. If your computer will not recognize your USB hard drive, you can try troubleshooting steps to resolve the problem.

Plug one end of the USB cable into the port on your hard drive and plug the other end into the USB port of your computer. Ensure that both ends of the cable are connected securely. Open "My Computer" (Windows XP) or "Computer" (Windows Vista/7). The USB device should be listed as "removable disk" once it is plugged into the computer. If it is not listed among the available drives on your computer, proceed to the next step. Ensure that the data cable is working properly. Try another USB cable if you have one available. Disconnect all other USB devices from the computer as they may interfere with the operating system detecting the external hard drive. Reboot the computer if the USB hard drive is still not recognized. Plug the USB cable into another USB port and check to see if the device is detected. If you are using a USB hub, remove the device and plug the external hard drive directly into a USB port. If the computer still fails to recognize the device, the external hard drive itself may be experiencing a hardware problem. Check the status of the hard drive in the "Device Manager" window. Under Windows XP, right click "My Computer" and select "Device Manager." For Windows Vista and Windows 7, click the "Windows" button in the lower left corner of the screen, then type "Computer Management" in the search bar and press "Enter." Select "Device Manager" in the "Computer Management" window. In the Device Manager window, click the "+" sign that appears beside "Disk Drives." If the external drive is not listed, click "Other Devices" in the Device Manager window and see if an "Unknown Device" appears. The external hard drive may have been detected but the device is not working properly. If it is still under warranty, take the device to the computer store where it was purchased to have it repaired or replaced. Hope this helps.

b>

Jan 04, 2013 | Apricorn SATA Wire 3.0 - storage...

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

Non of the 3 USB ports works anymore for unknown reason


ok, the answer is pretty simple, ur usb ports connect to a internal hub, that hub is what has malfunctioned, u need to reinstall that device's driver though the device manager on vista, go to start, type device manager in the search box, click device manager in the list, a uac query will appear, click continue, on device manager go to universal serial bus controlers and click the +, right click the usb root hub and uninstall it, repeat that for all of the usb root hubs, then restart ur pc, it will automatically reinstall the devices with a fresh driver, plug in your usb device and it should work, have a great day and happy holidays

Dec 31, 2009 | Toshiba Satellite A135-S2276 Notebook

1 Answer

Usb device not recognize


You mentioned that you uninstalled the unknown device from the Device manager. If you uninstall it then connected your usb flash drive you will see an error again on your device manager. This means that the driver for your usb port is not properly installed.

To install it, visit dell website, look for the model of your machine and locate the driver, download it then install from your machine.

Jun 02, 2009 | Dell Inspiron 6400 Notebook

1 Answer

How to install hi-speed usb to T21


You don't have the hardware, when you do, xp will install the driver automatically. You can get a PCMCIA card with usb 2.0 and plug it in the slot in the side, around $15 should do it and it is over 20 times faster than 1.1

Mar 12, 2009 | IBM ThinkPad T20 2647 Notebook

1 Answer

I plugged my Memorex TravelDrive into my computer. It has always worked perfectly. This time I got the message that the USB device was not recognized and I can't get into my files.


THE FOLLOWING IS COURTESY OF MICROSOFT Help and Support

When you plug a USB device into a Windows XP-based computer immediately after the computer comes out of standby (S3) or hibernate (S4), the computer may not recognize the USB device. When this issue occurs, the USB device may be listed in Device Manager as an unknown device, and you may receive the following warning message:
Unrecognized device has been found.

This issue occurs because, when the computer comes out of S3 or S4, there is a five- to ten-second period when the selective suspend feature of the USB driver will interfere with detection of a new USB device connection. The time period depends on several factors. This includes the following factors:• Host controller hardware
• Attached hubs
• Attached devices
• USB driver versions
• Support for USB 2.0
• Additional system hardware or configurations that may change the timing
There may be other reasons that a USB device is not detected

Method 1
loadTOCNode(2, 'workaround'); After the computer comes out of S3 or S4, wait five to ten seconds before you plug the USB device into the computer or hub.

Method 2
After the computer comes out of S3 or S4, unplug the USB device, and then plug the device back into the computer or hub.

Method 3
Use the Device Manager to scan for new hardware. Follow these steps: 1. Click Start, click Run, type Devmgmt.msc, and then click OK..
2. On the Action menu, click Scan for hardware changes. This causes Windows to recognize new devices.
3. Close Device Manager and Control Panel.

Method 4
Disable power management of the USB hub.
Note If you perform the following procedure, you may also reduce the battery life on a portable computer.
To disable power management on the USB hub, follow these steps: 1. Click Start, click Run, type devmgmt.msc, and then click OK.
2. Expand the Universal Serial Bus controllers node, and then follow these steps for each USB Root Hub that is listed: a. Right-click the USB Root Hub, and then click Properties.
b. Click the Power Management tab.
c. Click to clear the Allow the computer to turn off this device to save power check box, and then click OK.

SIMILAR PROBLEMS AND SOLUTIONS loadTOCNode(1, 'moreinformation'); For more information about advanced troubleshooting tips for general USB problems, click the following article number to view the article in the Microsoft Knowledge Base: 310575 (http://support.microsoft.com/kb/310575/) Advanced troubleshooting tips for general USB problems in Windows XP For more information about how to troubleshoot unknown devices in Windows XP, click the following article number to view the article in the Microsoft Knowledge Base: 314464 (http://support.microsoft.com/kb/314464/) How to troubleshoot unknown devices that are listed in Device Manager in Windows XP







Try restarting the computer with the device in. Sometimes if you clear the memory that might help (stating the machine without memory then put it back and start it again).

Jul 01, 2008 | Computers & Internet

1 Answer

Pentium III 800 mhz T21 Thinkpad Internet connection problems


why fight it , let it be on com 1 then,
go into the bios and disable the serial ports .
that may be the easiest fix as long as you don't need the serial port for anything.
but if you have a serial mouse oh boy.

May 13, 2008 | IBM ThinkPad T21 Notebook

1 Answer

Will not recognize Midair 25 (drivers installed)


Sounds like a USB issue. Is the device self powered? Did you try plugging in a different USB cable? Is it plugged into a powered hub?

USB 1.1 devices and USB 2 devices can cause issues together on the same bus or port. Try keeping devices separate or plug in just the maudio device. I had issues with USB Network adapters not being seen all the way because there was a older usb 1.1 device on the same hub.

Feb 15, 2008 | M-Audio Audiophile USB Audio and MIDI...

4 Answers

Pccard connect card option vodafone


some times the computer can not give the drive letter to asigne automatically like D:/ or E:/ or your computer does not support that usb driver ok you can make manual changes or detection just go to control panel, administrative tools, computer manager, storage , disk management, and you'll see on the right side at the top all the devices that they are recognized by the computer and at the battom you'll see all the devices plus the one does not have a letter assigned click on the one has no letter or it seds unrecognized with the right botton mouse so you'll see the list of options do format and change driver letter path check it and assigne the letter to be recognized by the system

Dec 04, 2007 | IBM ThinkPad T21 Notebook

Not finding what you are looking for?
IBM ThinkPad T21 2647 Notebook Logo

Related Topics:

334 people viewed this question

Ask a Question

Usually answered in minutes!

Top IBM Computers & Internet Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18385 Answers

Computer Links

Level 3 Expert

2385 Answers

Michael Vincent Cruz

Level 3 Expert

868 Answers

Are you an IBM Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...