USB Device not recognized

June 27, 2010 at 22:28:01
Specs: Windows 7

So the other day the webcam usb was working fine. I installed the latest software for it and the webcam image was really laggy and it made my laptop crash 3 times. I think it was the software, so i uninstalled it and installed the old one. But when I had to plugin the usb to install the drivers, it would pop up that message saying USB Not recognized. But after a while it worked again. Well I tried to use it again yesterday and it's giving me the problem again but now it won't go away at all. I've searched around for solutions and I've done a few of them but problem still there. I've read that sometimes turning off the PC for around 30 minutes might fix it but honestly I haven't tried that. Only for 3 minutes or so. But I doubt it will fix it.

Here's a screenshot of my USB devices from the Device Manager. http://i48.tinypic.com/11haz4m.jpg


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#1
June 28, 2010 at 00:26:00

The Unknown USB device probably is the web cam, unless you have something else plugged into USB that is not getting a good USB connection.

If you don't have the webcam plugged directly into a USB port built into the laptop, it may not be detected properly or work properly.

Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
http://www.computing.net/answers/ha...


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#2
June 28, 2010 at 01:30:56

Yes it's the webcam. The webcam usb is plugged directly to the laptop built in ports. I don't have any external ports. Like I said yesterday it was working fine and then later on it started the problem but after a while it worked again. Now it doesn't work again.

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#3
June 28, 2010 at 07:07:21

Assuming you haven't dropped the webcam and damaged it, if none of the rest of the possibilities I referred to at the link in Response 1 apply, and if other USB devices work fine when plugged into the same built in USB ports, then it's quite possible the USB plug on the web cam cord is damaged, or one or more wires in the cable are damaged, probably near the plug - in that case, it won't work properly with any computer. People often pull on the cord rather than the plug on the end of the cord when they disconnect things, or those things could be damaged at any time by yanking on the cord.

By the way, if you plug in a external hard drive one of the built in ports and the webcam into another built in port, some laptops can't actually supply 500ma from the built in ports and the external drive and web cam can't work properly when plugged in at the same time.
If you are using a PCMCIA USB 2.0 card (PC CARD) and a device is plugged into that, most if not all of those can only supply 500ma for all the USB ports in it, unless it has a jack an additional power adapter can be plugged into.


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Related Solutions

#4
June 28, 2010 at 10:41:11

I don't use any external drives.

The webcam cord is fine because I plugged it into another laptop and it worked fine. So something must be wrong with my laptop that doesn't want to recognize the webcam usb anymore. All of the other usb that I plug in my laptop work fine, it's only with the webcam that doesn't want to recognize it.


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#5
June 28, 2010 at 10:43:52

Lol. I just plugged in the webcam again and it worked. But I bet later on when I plug it again it will give problems again. I'll see.

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#6
June 29, 2010 at 09:28:13

"...it's quite possible the USB plug on the web cam cord is damaged, or one or more wires in the cable are damaged, probably near the plug."
"People often pull on the cord rather than the plug on the end of the cord when they disconnect things, or those things could be damaged at any time by yanking on the cord."

Wiggle the cord near the plug to see if you get the symptoms / don't get them. If that's your case, a wire inside the cord may be broken near the plug but the insulation where it is broken is intact - in that case, if the broken wire ends still touch each other the connection will be intermittant and unreliable - it will work okay sometimes, sometimes it won't.
The same thing can happen to corded mice, keyboards, other corded things.

Sometimes the USB port is physically damaged. The USB plug should be a snug fit - not be loose in the port. Sometimes the outer metal shell of the port gets bent, or the outer shell of the plug gets bent, or the plastic blocking plug that prevents you from plugging in a plug upside down may be loose or missing in the plug or in the port, or the contacts inside the plug or the port may be bent.


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#7
July 13, 2010 at 20:13:16

Well I'm still having the problem. And like I said, the webcam works perfectly fine with other laptops/computers. So the camera is not damaged neither are my USB ports. There must have gone something wrong with my laptop that refuses to recognize this webcam only. I don't know what else to do and I really don't want to reinstall my windows just because of a webcam.

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#8
July 13, 2010 at 20:58:30

Read ALL of the info at the link in Response 1.

One of those things is probably the cause of your problem.


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