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Dimension 2400 USB problem

by jimdris / May 28, 2009 5:38 AM PDT

The 2 USB ports on the front and 2 on the back no longer function. They have power (will run a little fan gadget) but windows does not recognize devices such as thumb drives or card readers. Occasionally a device will be recognized for about 5 seconds and then quit.

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Hi, jimdris:
by Osprey4 / May 28, 2009 10:24 AM PDT

This is usually caused by a drive letter conflict. The best way to resolve it is to remove all USB devices, then uninstall the USB controllers and hubs from Device Manager, then reboot and allow your controllers/hubs to reinstall.

Nest, try plugging in one device at a time. If you expect to use multiple devices in the same port, use disk management to re-assign their drive letters.

Let me know if that helped.

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Big Improvement
by jimdris / May 29, 2009 2:24 AM PDT
In reply to: Hi, jimdris:

I followed your advice to the "T" and it has helped as far as getting rid of the yellow exclamation marks in Device Manager. I reconnected my external hard drive and webcam w/o problems(they had been working before) and was able to use an older Daisy MStick card reader which I hadn't tried in a long time. I still have no luck with recognizing flash drives and my MS ProDuo card reader. It says "found new hardware" then "installed and ready to use" then "USB device not recognized". These devices work fine on my wife's Compaq and on our Toshiba laptop.

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Ok, some progress
by Osprey4 / May 29, 2009 10:31 AM PDT
In reply to: Big Improvement


Use disk management to assign higher drive letters to the existing devices. For example, my permanently connected external hard drive and card reader are set to V and W. Generally, newly connected flash drives will take the next available letter, which for my system would be H.

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