We need a little more information.
Does the  external drive have a power supply?
Is there any sign that you can tell that power is going through to the unit?
Are you able to see the power light come on?  If not is there any activity
that you can feel if the  unit is powered on?
If there is a power supply is this emitting heat or cold?

If the drive is powered from the USB Port is there an optional connection to
increase power to the drive?
Have you installed any other devices since yesterday?
Have you tried plugging the drive into another USB Port?
Have you tried plugging another device into this Port to check it works - a
USB Pen drive for example.
Do you have access to a friend's computer to check to see if the drive works
on another machine?

If it is not  a hardware or power issue There are steps for you to take to
re-install  your USB drivers which I can post. However this will obviously
not work if there is a power or hardware failure issue  so information on
this is the best initial step.

Regards

David Griffith
My Low Vision Resources Web Site  is
http://www.nonags.org/members/dajgriff/

-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Nancy
Shackelford
Sent: Wednesday, 06 May 2009 13:04
To: [email protected]
Subject: [Blind-Computing] Computer suddenly doesn't recognize USB port
ordevice

I have an external hard drive with music on it. I accessed it yesterday from

this computer, but no matter what I do, it will not recognize it today. How 
do I get the computer to recognize it? It's a USB device.

TIA,
Nance

Nancy Shackelford
Walk On Faith & Trust In Love - Michael Reed 


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