My WD 1 T external not reading on PC

My 1 T WD External hard drive is not reading on my PC, it starts spining inside then goes silent but lights keep blinking, what can i do?

Check if the hard drive is recognized on the disk management window, you can also try running a test using DLG. Follow the link below for the steps. 

How to access Disk Management in Windows 7, Vista, XP or 2000 to manage your hard drives

How to test a drive for problems using Data Lifeguard Diagnostics for Windows

I have treied still no solution, the link blinks, the WD 1T starts spinning then suddenly goes silent, it tries to show on PC but latter disapears. very stressed now pls help

it does but disappears again