Flashing light - not recognising device

I’m having exactly the same problem and after running diagnostics, I received the following test results :

 (Simply my WD Passport doesn’t appear in My Computer. It appears in Device Proprieties, in the control panel under Devices, but not in My Computer so i can’t access to see files inside it.)

Test Option: QUICK TEST
Model Number: WD My Passport 0740
Unit Serial Number: [Deleted]
Firmware Number: 1003
Capacity: 0.00 GB
SMART Status: Not Available
Test Result: PASS
Test Time: 12:49:54, March 24, 2014

What can I do else ?