USB Devices not recognizing.

Do you have a question? Post it now! No Registration Necessary.  Now with pictures!

Threaded View


My USB's don't respond to any devices plugged in.

I've tried uninstalling/reinstalling them under Device Manager, but
still does not respond.

I've read that maybe updating my BIOS may help but I'm having
difficulties with that.

# I'm running on Windows XP
# Motherboard: ASUS P5K SE
# Service pack 2

If it's possible for any help or links to updates, that would be
extremely helpful.


Re: USB Devices not recognizing.

Quoted text here. Click to load it
If you have USB enabled in the bios
and it shows up in device manager
that's about all you can may just plain be defective.

If your on-board USB is not working...
just add a PCI -USB card

Re: USB Devices not recognizing.


I was wondering if it was possible to fix it rather than replacing it.

Yes, the USB's are enabled but it still does not seem to respond.

Infact, unknown devices seem to pop up constantly until i disable one
of the USB ports.

Thanks for your reply.

Edit: Other methods that can help fix it would be appreciated, cheers.

Re: USB Devices not recognizing.

[B2TB]esc wrote:
Quoted text here. Click to load it

Reinstalling your current OS would be one option.

Boot an alternate OS, like a Linux LiveCD distro, would be
a way of testing the USB without reinstalling Windows. So you
could see whether your hardware is handled properly, and determine
from that whether the problem is hardware or software. A distro
like Knoppix, is a 700MB ISO9660 file, which you burn to a
CD, and then the CD can be booted to a working Linux desktop,
without installing anything to the hard drive.

Uwe's site is good in terms of addressing some of the problems
seen with USB. Your symptoms aren't an exact match for the
stuff I see here, but you should still read this, because
it gives some hints about how some of the software process
works. For example, "XP asks for drivers"...

Your board has an ICH9 Southbridge.

1) Up to 12 USB ports
2) Six USB 1.1 logic blocks (one logic block per two ports).
3) Two USB 2.0 logic blocks (one logic block per six ports).
4) Ability to change (3), such that one of the pairs of ports
    is moved to the other USB 2.0 logic block. Intel did that,
    just to make the hardware design more difficult :-)

The following listing would be an example of an uneven arrangement
of ports, with respect to the USB2 controllers. If you go into
the "details" section in Device Manager for a properly installed
USB logic block, the enumeration PCI\VEN_8086&DEV_2934... and the
like, should be there. (I don't have an Intel chipset on my
current board, so this is a guess on my part, that the VEN is
8086. The DEV info is from the ICH9 datasheet and the Spec Update.)

8086:2934  D29:F0 USB1.1  #1  \
8086:2935  D29:F1 USB1.1  #2   \
8086:2936  D29:F2 USB1.1  #3    \
8086:2939  D29:F3 USB1.1  #6     \___ Eight ports accounted for,
                                  /    in USB1.1 or USB2.0 mode.
8086:293A  D29:F7 USB2.0        /     Five Device Manager entries.

8086:2937  D26:F0 USB1.1  #4  \
8086:2938  D26:F1 USB1.1  #5   \___ Four more ports accounted for,
                                /    in USB1.1 or USB2.0 mode.
8086:293C  D26:F7 USB2.0      /     Three more Device Manager entries.
                                     (USB2 entry = "Enhanced")

The reason I'm listing those numbers, is so you can compare them
to what you're seeing (either for Unknown Device Manager entries,
or for the USB stuff that does install properly).

There are also procedures for cleaning up the USB stack (deleting
devices in Safe Mode, or using a Devcon script), but I'm not
sure in this case, that it would help.

See "renewUSB.bat", which uses devcon.


Site Timeline