click start control panel administration tools computer management device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red xright click to reinstall drivers or
if you can see your usb but its not workingports(com&lpt)right click update driver
if this fails to fix the problem
check usb leads for secure dust free seating
sometimes the wires inside the cable will be damaged due to bending or stretching or placing heavy equipment upon the cable
just replace the cable of the hard disk, when you plugged the external disk drive you got that windows could recognize the USB device change the cable everything should work fine again,
check the USB leads that attach to the motherboard usually red-white-green-black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems hope this helps
rather doing a driver hunt which can take hours
http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html
it might take some time being a freeware driver solution
note: it will find all of your outdated drivers
this is a free driver solutions they will automatically search for and find the correct driver also at cnet http://download.cnet.com/2000-20_4.html on the home page you should see a search tab just type in what you are looking for IE: motherboard name sound drivers
http://www.innovative-sol.com/drivermax/ free program, paid update available
hope it helps
Click on Start, Run, and type regedit and press Enter Click on the plus signs (+) next to the following folders
HKEY_LOCAL_MACHINE
SYSTEM
CurrentControlSet
Control
Class
{4D36E965-E325-11CE-BFC1-08002BE10318}
This folder is the DVD/CD-ROM Drive Class Description in the registry. Look for any of the following names in the right hand column.
Upper Filters
Lower Filters
Upper Filters.bak
Lower Filters.bak
If any of the above keys shown in step 4 are listed, right-click on them and choose DeleteAfter deleting the keys, close the registry editorReboot your computerOpen My Computer and check to see if your CD or DVD drives have returned. You may also want to open Device Manager and verify that the yellow exclamation and error code on the CD or DVD drive is gone.
hope it helps
click start control panel administration tools computer management device manager look through all of your devices if you see a yellow question mark?or exclamation mark ! or red xright click to reinstall drivers or
if you can see your usb but its not workingports(com&lpt)right click update driver
sometimes the wires inside the cable will be damaged due to bending or stretching or placing heavy equipment upon the cable
just replace the cable of the hard disk, when you plugged the external disk drive you got that windows could recognize the USB device change the cable everything should work fine again,
check the USB leads that attach to the motherboard usually red-white-green-black make sure they are securely seated and have no dust build up on them dust will cause static and a lot of unforeseen problems
if this fails to fix the problem type in run "regedit" then press ok then you can see registry editor then locate below key. HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E965-E325-11 CE-BFC1-08002BE10318} And remove upper filter and lower filter. Then restart computer then check. Also locate the below key and make sure it's value is 3 not 4. HKLM\system\currentcontrolset\services\usbstor make sure start value is 3 not 4
if still no luckyou might have to install a usb 2 or 3 card they are cheap and easy to install you can buy these on Ebay very cheap hope this helps
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