Having problems with your HP Hewlett Packard Compaq dx2400 Microtower - KR604UTABA PC Desktop ?

Dx2400 with xppro, usb devices doesn't work

\015 Hey there, \015\012we have tried to reload a new image, even that didn't solve the problem.\015\012ipod, usb keyboaord, disk on key, nothing.\015\012Hp support team couldn't solve it too.\015\012Any idea?\015\012Thanks in advance,\015\012Jc\015\012.\015

Answers :

I don't think it would be the power supply as the motherboard regulates the voltage to the USB rail.
\015\012Firstly, 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;


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.
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