External Hard Drive not appearing or formatting

I have a WD external hard drive and a few days ago it stopped working. The name under This PC turned from "My Passport" to "Local Disk" and an error messaged appeared when I tried opening/formatting the disk saying windows is unable to format the disk. I tried formatting it with Partition Wizard and EaseUS, but that did not work either...I tried creating a new partition using those software applications, too, but they always take a really long time. I waited overnight for a partition to be created, but when PW said it was finished creating the partition, nothing showed up.

Now, not even the "Local Disk" shows up under This PC or Disk Management. I don't know what to do to format the external hard drive...
 
Review http://www.wdc.com/wdproducts/library/UM/ENG/4779-705007.pdf .

Power - does LED light up? is the cable fully inserted? is the USB port properly powered (do not connect through a hub which shares power)? can you try another cable?

Drivers - any other issues with USB connection in Device Manager?

Hidden issue in your computer - Can you test on another computer?

See following for similar issue and its resolution: http://www.tomshardware.com/forum/299213-32-passport-hard-drive-huge-issue
and http://www.tomshardware.com/forum/296949-32-passport-external-failure (especially 'Diligent' on May 16, 2014)
 
Go to Disk Management and delete partition and volume until you have unallocated space.. Then start anew by defining a new simple partition..
 
If your HDD`s MBR is damaged then this kind of problems appear, if the DATA in important u can recover it using some software like Getdata or Active file recovery. u can recover MBR by Wondershare live CD without any data lose. There are lot of ways to approach this if your HDD is detecting in BIOS
 
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