The drive has gone bad. This is a common occurrence with drives and there is not a whole lot that can be done to stop it from happening. What you will want to do is see if there is still warranty on the drive. If there is Wester Digital will replace the drive for you.
If the drive is not spinning up this is not something you are going to be able to recover on your own.
The only real option here would be to send the drive to a data recovery shop. The link below is a list of companies that can provide the service.