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When I come to load new hardware to my computer it says I dont have sufficient usb access (or in so many words). I have the 'root hub' and 'host controller' so i dont know what the problem is!! please help!

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  • clairelou402 Aug 08, 2008

    how do I solve the problem? when i go to my computers 'properties' and click on 'device manager' it shows 5 universal host controllers (to different numbers) and 5 root hubs, do i need all of them?

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Some usb hubs don't handle enough power to maintain all the items. I'm not possitive if this is your problem but it sounds like a similiar problem I had in my office and that was the problem.

Posted on Aug 08, 2008

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Where is the USB root hub on a Gateway PC so I can plug in my mass storage device


You don't plug a device into a root hub. The root hub is the central detribution point for all the USB ports on your computer. Your storage device should plug into any available USB port. If you are talking about an internal port then it is possible that you dont have one or may have to attach wires to make a port usable. Take it to your local computer guru and he/she should be able to help you for little or no cost.

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Gateway 310 s won't recognize a cd


Hello,
Method 1: Initiate recognition of the USB device by using Device Manager loadTOCNode(2, 'workaround'); To initiate recognition of the USB device by using Device Manager, follow these steps:

1. Click Start, click Run, type Devmgmt.msc, and then click OK. The Device Manager window opens.
2. Click to select your computer as the location for the scan.
3. On the Action menu, click Scan for hardware changes.

Windows XP recognizes the new device.
4. Close the Device Manager window.

If this method resolves the issue, you are finished.

If this method does not resolve the issue, go to method 2.
Method 2: Disable power management of the USB hub loadTOCNode(2, 'workaround'); Note If you perform the following procedure, you may also reduce the battery life on a portable computer.

Use this method if method 1 does not work. To disable power management of the USB hub, follow these steps:

1. Click Start, click Run, type Devmgmt.msc, and then click OK. The Device Manager window opens.
2. Expand Universal Serial Bus controllers.
3. Right-click a USB Root Hub in the list, and then click Properties. The USB Root Hub Properties dialog box is displayed.
4. Click the Power Management tab.
5. Click to clear the Allow the computer to turn off this device to save power check box, and then click OK.
6. Repeat steps 3 through 6 for each USB Root Hub in the list.
7. On the Action menu, click Scan for hardware changes.

Windows XP recognizes the new device.
8. Close the Device Manager window.

If this method does not resolve the issue, go to method 3.

Click Start, click Run, type Devmgmt.msc, and then click OK. The Device Manager window opens.
Uninstall all the usb controller from USB controller
and now restart the computer.

If this method does not resolve the issue, go to method 4 .
Method 3: Restart the computer loadTOCNode(2, 'workaround'); To initiate recognition of the USB device, first unplug the USB device and restart the computer. Then, wait five to ten seconds before you plug the USB device into the computer or hub. Windows XP recognizes the new device.

Hope this helps.

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1 Answer

My usb ports are not recognizing any devices such as my iphone, ipod, etc. I have a dell dimension 4700 runnning win xp sp3


It seems that many people are still getting the 'USB Device not Recognized' problem from time to time. Unfortunately there is no easy fix.

Firstly, it's recommended that you make sure every one of your motherboard drivers are completely up-to-date, but you probably already knew that.

In XP, after a USB port isn't used for a long while the USB driver built into the OS sets the OHCI controller to suspend. When you plug a device back in, it can sometimes fail to 'wake up' properly. This problem was supposedly fixed in SP1 but there is a related registry hack that may still be able to help.

Run regedt32.exe and navigate to;

HKEY_LOCAL_Machine\SYSTEM\CurrentControlSet\Services\Usb

Create the Usb key if it doesn't already exist. Under this key, create a new DWORD value called DisableSelectiveSuspend and give it a value of 1. Then restart the PC.

A long shot perhaps, but I recall having similar problems with a USB hub built into my Microsoft keyboard and adding this key seemed to solve it. It wouldn't hurt in trying icon_smile.png.

Alternatively, removing all entries relating to USB in Device Manager and all associated USB drivers will force XP into refreshing the USB driver stack.

Begin by unplugging all USB devices, then use Add/Remove Programs in Control Panel to uninstall any USB driver software. Next, boot up into safe mode and go to Device Manager. Once in device manager make sure 'Show hidden devices' is checked under the View menu. Uninstall all device entries in this order;

1. USB peripheral devices (printers etc.)

2. HID and/or Composite USB (Human Interface Devices) You're using PS/2 input devices so you may not have this entry.

3. USB Root Hub(s)

4. USB Host Controller(s) (Universal or Enhanced Host Controllers)

Then boot back into Windows (not safe mode) and it should populate the Root Hubs & Host controllers again. Proceed to plug your USB devices back in, starting with your powered hub. Be aware that most USB printers and scanners need to have their drivers installed first before you plug them in.

Any doubts you can get the help of a technician through

www.thebestpcdoctor.com

Toll free: 877 407 9229

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1 Answer

Usb port not recognized any device


  • Don't worry just follow the simple steps and get rid out of that problem
    • Unsecure or Loose Connection
    Unplug the presently connected USB device (if any). It is quite possible that the connection is not secure and has become loose. Re-plug the USB device tightly and firmly into the USB port. This is one of the most common reasons for an error in detecting a USB device.
  • Scan for Hardware Changes in Device Manager
    Use the Device Manager to scan for new and recently installed hardware. From the Start menu, select the Run option. In the pop up box, type in Devmgmt.msc and then click Ok. From the Action menu, click Scan for hardware changes. This will make Windows scan & recognize any new devices that are installed. Now, close all opened device managers and control panels. Now, follow the above step and see if your computer detects the USB device.
  • USB Hub Power Management
    Disable power management of the USB hub. To disable the power management on the USB hub, follow these steps; Click Start, and then click Run. Type devmgmt.msc in the popup box, and then click Ok. Expand the Universal Serial Bus Controllers' node, and then follow these steps for each USB Root Hub that is listed.

    1. Right-click the USB Root Hub and then click Properties.
    2. Click the Power Management tab.
    3. Click to clear the Allow the computer to turn off this device to save power check box, and then click Ok.
    Note: If you perform the following procedure on a laptop computer, you may reduce the battery life.
  • Sometimes, simply unplugging the USB device and turning off the computer for twenty minutes and then restarting may solve the issue. If none of the above options have solved the problem, check the manufacturer's website for new driver information. It is possible that your drivers need to be updated. There could also be a possibility of hardware failure, which needs to be checked by a hardware expert.
Please rate me if this solution works for you

Thanks......Have a great time

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1 Answer

Connecting HDTV to computer


maybe you have installed the wrong driver..

if your device manager says bunch of yeloow question mark it means you have hardwares that are not working or not yet installed..

try to download your installer here...

click here
http://support.dell.com/support/downloads/driverslist.aspx?c=us&l=en&s=gen&os=WW1&osl=en&catid=&impid&SystemID=DIM_PNT_P4_8400

Feb 11, 2010 | Dell Dimension 8400 PC Desktop

1 Answer

Dx2400 with xppro, usb devices doesn't work


I don't think it would be the power supply as the motherboard regulates the voltage to the USB rail.

Firstly, it's recommended that you make sure every one of your motherboard drivers are completely up-to-date, but you probably already knew that. You can update these by downloading them from your motherboard manufacturers' support website.

In XP, after a USB port isn't used for a long while the USB driver built into the OS sets the OHCI controller to suspend. When you plug a device back in, it can sometimes fail to 'wake up' properly. This problem was supposedly fixed in SP1 but there is a related registry hack that may still be able to help.

Run regedt32.exe and navigate to;

HKEY_LOCAL_Machine\SYSTEM\CurrentControlSet\Services\Usb

Create the Usb key if it doesn't already exist. Under this key, create a new DWORD value called DisableSelectiveSuspend and give it a value of 1. Then restart the PC.

A long shot perhaps, but I recall having similar problems with a USB hub built into my Microsoft keyboard and adding this key seemed to solve it. It wouldn't hurt in trying icon_smile.png.

Alternatively, removing all entries relating to USB in Device Manager and all associated USB drivers will force XP into refreshing the USB driver stack.

Begin by unplugging all USB devices, then use Add/Remove Programs in Control Panel to uninstall any USB driver software. Next, boot up into safe mode and go to Device Manager. Once in device manager make sure 'Show hidden devices' is checked under the View menu. Uninstall all device entries in this order;

1. USB peripheral devices (printers etc.)

2. HID and/or Composite USB (Human Interface Devices) You're using PS/2 input devices so you may not have this entry.

3. USB Root Hub(s)

4. USB Host Controller(s) (Universal or Enhanced Host Controllers)

Then boot back into Windows (not safe mode) and it should populate the Root Hubs & Host controllers again. Proceed to plug your USB devices back in, starting with your powered hub. Be aware that most USB printers and scanners need to have their drivers installed first before you plug them in.

Hopefully some of this may be of help, let us know how you get on.
Regards..

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1 Answer

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It does sound like your ports on the front might be bad. They usually connect to a seperate port on the motherboard than the rear ones, and I have seen devices short out the front ports, such as a USB music player.

You can remove the ports on the device manager, and they should come back ok, without worry. However, I doubt that is going to help the front ones. I think you have a hardware problem.

If that is the case, the easiest solution is to get a USB hub, and run a USB cable from the rear, to the front of the computer.

Mar 28, 2009 | Dell OptiPlex GX260 PC Desktop

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).

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i'm looking for those with question marks or exclamation points...

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one way would be to download and install latest device drivers from the net. it should help.. if you are using win XP, there is likely a BIOS or Windows configuration problem. On some computers there is a configuration option in the BIOS that asks whether an IRQ should be assigned to USB. Although the option's actual wording varies among BIOS manufacturers, you must enable this option by setting it to either On or Yes (depending on your BIOS manufacturer and BIOS version). Otherwise no USB devices will work on XP. A problem with Windows XP’s USB Controller configuration can also prevent any USB devices from working. To determine whether the USB controllers are working properly, open Device Manager and expand the Universal Serial Bus Controllers node. Beneath this node, you should see a USB Universal Host Controller and a USB Root Hub. Depending on your PC, there will either be a USB Universal Host Controller and a USB Root Hub listed for each of your computer’s USB ports or a USB Universal Host Controller and USB Root Hub for multiple ports

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