Hard disc malfinction

After pluging in my WDpassport 1tb hard ■■■■ to my CPU ,the system isnt reading it…ive tried uninstalling and then installing but doesnt work,and i had to format my entire hard disc for this …plus the lignt the blinks when its inserted in CPU,its not blinking anymore…it has only been 3 months i bought it online.

Have you tried replacing the USB cable? Does it work in another computer? Which operating system do you use?