Computer will not recognize Hp pd1000a terabyte external hard drive

I have a 1 terabyte external har drive, model no. hp pd 1000a. I recently loaned it to a co worker so he could download some files from it. He came to me and said it had stopped working. I plugged in back into my laptop and now does not get recognized or read. I have tried on other computers and still no change. I have even tried keeping it plugged in usb and rebooted computer....nothing. The indicator light comes on and flashes, you can also feel and hear the drive mechanism working. I have a lot of documents on this drive that needs to be recovered, and have no back up file.
Please help!

i cannot use both at the same time for some reason.
all my music is now stored on the external hard
drive but i can't access ipod if the external hard
drive is on. please help. i've tried contacting
dell but they can't help.
allen
Hi, Allen.
I had exactly the same problem (See my post of early this day). Get a powered external usb hub. Run your external hard drive off it. Your iPod shoud work fine off an on board usb port.
If this doesn't work, install a pci expansion card with usb ports for the hard drive.
HTH.

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