Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: USB Unknown Device Errors

27 Jun 2009   #1

Windows 7 RC
USB Unknown Device Errors

Hi All, I'm new around here but I've just solved a problem that may help anyone else who has the same thing happen.

I got a new Dell Studio XPS 13 laptop a week or so back, loaded W7 RC and everything worked fine after a bit of fettling here and there. On Tuesday or Wednesday I had a problem where the laptop locked up while using a Logitech USB Radio mouse. Thinking the mouse caused the lockup, I disconnected it and have been using the touch pad since and no lockups. So far so good. Then today I plugged in a set of Logitech USB headphones for Skype and I got an 'unknown device' error. I tried with other USB items, ADSL modem, memory stick, all had the same problem on both USB ports and nothing I did would solve the problem. Much googling and a search of this forum again came up with nothing I could use. I then had a flash of brilliance - I figured it must have been the mouse that started the problem when the laptop froze and somehow something was blocking the USB useage. I plugged in the mouse whereupon it loaded up the software and worked fine, and now everything else loads up and works OK too!

I can't explain it, I'm just a programmer and don't really understand computers but if it helps anyone else in the same frustrating situation, there it is.

My System SpecsSystem Spec
19 Aug 2009   #2

Windows 7 x32

Hi Guys

Have read through this post, I have similar problem though I'm more confused now.
I have 3 External HD and one Semi-External (backup unit HP). None of them works through USB ports (none of my 8 ports).
Not even the four Mem sticks I have tried works.

W7 says unknown devices.
1. I have tried all ports.
2. I have tried on Vista and XP on other machines (no problems).
3. I have had these units working on this hardware before (in vista).
4. I have the latest of everything as it seems.. (i think).
5. I have reinstalled with them plugged in and not like 4 times..
6. I have tried several updates and even tried with old USB drivers..
7. I found a writing on a 4 step check and did that to (power management, uninstall, checking power etc.. )
8. tried different cables
9. ...

What the H...

My keyboard works (W-less).. My Camera works.. ? on all ports..

Any one have similar problems ?
This is driving me crazy ..

Best Regards
My System SpecsSystem Spec
08 Mar 2010   #3

windows xp

I Have the same probleme except that nothing works on the USB ! Even the web cam included in the Hp Pvillion DV9443, doesn't work ! It's listed has unknow device.
I got that problem after I done a clean install of Windows 7. I have now gone back to Vista, but I now have the same with Vista. It was working fine before I try to install Windows 7?

Any clues ?

My System SpecsSystem Spec


 USB Unknown Device Errors

Thread Tools

Similar help and support threads
Thread Forum
Unknown device in device manager after Bios default settings are
applied. Sorry that last word didn't get in the subject line. So: These two values are: USB\VID_0CF3&PID_3000&REV_0200 USB\VID_0CF3&PID_3000
Unknown device In device manager, by a virus ?
Hello everyone, I hope you could give me some clue that may have caused the appearance of an unknown device. All information here : First, That was solved by uninstalling and rebooting, did not appear anymore. But as...
System Security
Unknown Device in Device Manager/Show Hidden Devices
I have a Toshiba laptop, model L505-ES5018. I had Windows 7 Home Premium 64 bit installed on here, but decided to reformat my hard drive using Windows 7 Ultimate 64 bit. After the reformat was finished, I ran Windows Update and it found several items to download and install for me. I noticed...
base system device, video controller and unknown device missing
hie i have just installed window 7 and this devices are missing, any help will be very much appreciated. base system device device id PCI\VEN_1217&DEV_7110&SUBSYS_117C10&PEV_00 PCI\VEN_1217&DEV_7110&SUBSYS_117C10CF PCI\VEN_1217&DEV_7110&CC_088000 PCI\VEN_1217&DEV_7110&CC_0880 UNKNOWN...
Device Manager reports Unknown Device & explorer crash
How do i figure out what driver or even component windows wants software for when in the device manager under other devices it lists an unknown device and windows update cannot find anything. Oh and is it appropriate for me to use this topic to ask another question regarding explorer.exe as...

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 23:50.
Twitter Facebook