First Go to this link.
Where they will explain the differences of the meanings of the flashing lights. There are so many variables, that it would be to difficult to figure out unless I was actually working on the disk itself. But the page is very easy to understand, and hopefully you'll find what I did, was all I need to do was to power down and up again.
Then, if that doesn't solve the problem, then you have to determine if the drive is working or not.
Either the drive itself failed or you did not stop your external hard drive
safely in your PC or Macintosh before unplugging either the power or data cable
.1: Determine if the drive itself has failed
For purposes of testing, connect the power adapter directly to the wall. If you do not hear or feel the drive spin up when you connect the power, the drive will need to be replaced. If the drive spins up, but nothing shows up in My Computer or in Disk Management, change the USB cable and connect the new one to another port on your Computer. If it still doesn't show up in Disk Management, try the drive on another PC
to see if it shows up on that computer. If that computer still does not detect the drive by showing you the system tray icon or by listing the drive in the Device Manager
after you plug in the drive, the drive is bad and needs to be replaced.
If you require data recovery
services on your failed drive, here's a list of authorized preferred data recovery partners
If you find that you do need to replace your drive, here's a link to WD to replace it.How can I replace a product under warranty?2: Determine if the drive can be used again
If the computer does detect the drive, you can test the drive by using WD's Windows Data Lifeguard Diagnostics
. For more information on how to use the software
to test the drive, Click here: How to test a drive for problems using Windows Data Lifeguard Diagnostics
Now If the software reports an error for the drive, you will need to look up what it means here: Data Lifeguard Tools 11 Error Codes
If the software shows no errors for the drive, and you do not wish to send the drive for data recovery, you can partition and format the drive so you can use it again. For step by step information on how to format the drive click below:How to partition and format your hard drive (from unused space) for use in Windows XP or Server 2003IMPORTANT:
To avoid corrupting or losing the data on your external hard drive you should always shut down the drive correctly before you disconnect the data cable from the drive or computer, or the power connection from the drive or the wall outlet.
I hope this helps and Good Luck!