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My usb ports just stopt working 4 no reason - Computers & Internet

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Try to install new Operaing system and then check again.

Posted on Jul 16, 2010

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Posted on Jan 02, 2017

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Hello and Welcome to FixYa!
The error you quoted can be due to multiple reasons. Following are some main Possibilities, that you should keep in mind.

Make sure, the USB port, you are inserting data traveler in, is in working condition. And you are connecting the device properly.
This could happen due to Software conflict, for this you need to remove all the devices connected to USB ports (other than keyboard, and Mouse) and need to restart the system.. Moreover, you can check for the exact error, in the device manager list...
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USB port stopt working. Got an error in device manager. Unknow device under usb controllers. There is no driver installed. Reinstall all the drivers, then i get the message all drivers are already...


Hi,
the easiest way to fix this problem is using a linux free live distro to boot up your pc and check if the USB works. If it doesn't, it means your motherboard has some broken transistors/components and you may need to change it if still under warranty. To boot up from a linux cd, you need to download an iso (from here http://www.livecdlist.com/) and burn it on a cd. Then you must restart your computer with the cd inserted and boot from it (you can consult your motherboard's manual for the how-to).
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Try connecting the hub to another USB port. You may even connect this same device to another computer and check if that works. This will help isolate the issue better.

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KVM are not the most reliable and will fail sometimes. The quickest way to get it back is to plug into a different USB port for the one that is active.

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1 USB Port Failure


Hi Guys

Unfortunately after looking at the computer installation details i was at fault, although i have had
the computer for well over 2 years and this is the first time it has happened.
My Dell Dimension 5150 has 7 USB ports 5 at the back and 2 in the front and it appears that i have
connected the keyboard and mouse to the wrong ports.
There are two ports at the bottom allocated for the keyboard and mouse and for some reason i had
them in the top three ports hence my problem but still not sure why it happened.
Anyway my Dell Dimension 5150 is now running OK and no further help is needed.

Many Thanks.

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Havimg prob with the 2 usb ports located in front


Hi manky, Normally front USB ports have a pair of 4 wire cable with connectors marked red wire is vcc; white wire is -D; green wire is +D; and black wire is gnd. The motherboard would normally have two pairs of dual pin connectors that would be sitting side by side or in-line with uneven pins - 4 and 5 pins; then another 4 and 5 pins. Please refer to the attached simple diagram for your connection. For some reason I couldn't get hold of a manual from the Gigabyte site of your particular model GA-81KHXT. Nonetheless hopes this works for you. Pls post again how things turn up. Good luck and kind regards.

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