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HP G72 usb ports

Posted on 2013-10-29
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Last Modified: 2013-11-06
HP G72 laptop
Device manager tells me there is an unidentified device inserted
when nothing is pluged in to ant port
ports wont read my flash drive (unrecognized)
but will find and work with usb mouse
all ports are clean and unbroken
thanks for any help
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Question by:RobertMClark
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Expert Comment

by:web_tracker
ID: 39609689
does the usb flash drive work in another computer. Try rebooting the computer, often when a device is not detected properly and it will prevent other devices from being detected. Rebooting the system may help flush the information from the failed attempt. If that does not work you can use the MS fixit tools to resolve this problem. See this page: http://support.microsoft.com/kb/817900  you can either manually solve the problem or use the fix it tool by following instructions on this page.
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Author Comment

by:RobertMClark
ID: 39611535
Thanks for your help
G72-B66US  Win7 64
updated and reinstalled all drivers as you reccomended
still have the persistant "unkown device" in device manager
after several reboots with all usb ports empty.
The op system will find and install USB mice,network adaptors,and printers
but wont install known good mass storage devices(flash drives)
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LVL 93

Expert Comment

by:nobus
ID: 39611776
post a screenshot of the device manager
can you identify the device?
here is how :
if you have  unknown devices in device manager, you can use this procedure to identify them :

1-visit the motherboard manufacturers support site, for downloading drivers
2- use windows update >optional updates to find them

3-Start>Programs>Accessories>System Tools>System Information.
Now select  "Components" and highlight "Problem Devices".
All hardware devices with a driver problem will be listed here.
Make a note of the first line of the PNP Device ID line of the entry. It will show a Vendor number and a Device number (VENxxxxDEVxxxx) both four digits long.
Look up those numbers here:   http://www.pcidatabase.com/index.php

This will tell you the manufacturer and the chip number.  
Check the manufacturer's website first or google them - or post them here

If your LAN is running, you can also use windows update> optional drivers, or  use slimdrivers : https://www.slimwareutilities.com/slimdrivers.php
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LVL 18

Expert Comment

by:web_tracker
ID: 39612264
did you run the microsoft usb fix it untility as I mentioned? you have to scroll down to almost the bottom of the page to find the utility. It does a good job of resolving usb problems.
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LVL 18

Expert Comment

by:web_tracker
ID: 39612326
Follow the directions on this website to find out what device is that is missing the drivers: http://www.wikihow.com/Identify-Unknown-Devices-in-Windows
http://www.technize.info/3-ways-to-find-unknown-device-drivers-in-windows/

Use this fix it to fix devices that are not properly detected or installed.
http://support.microsoft.com/mats/hardware_device_problems/
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Author Comment

by:RobertMClark
ID: 39617154
I have followed all the suggestions
thank you all
I wiped the HDD and did a clean install of XP pro
the ghost device followed into the new system
and the symptoms remained the same
looks like a motherboard problem.
Close this out.
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LVL 93

Expert Comment

by:nobus
ID: 39617367
well -  i would look first in the bios - to see if perhaps usb is disabled

for closing - you are supposed to do this yourself; for more info on closing, look in the help section - closing questions
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Accepted Solution

by:
RobertMClark earned 0 total points
ID: 39617398
I think is USB turned off it would not find a usb mouse or usb NIC
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Author Closing Comment

by:RobertMClark
ID: 39626813
gave up
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