Things I have tried:
(0)Checked whether it is plugged in correctly.
(1)Connected the hard drive to another computer and it only worked once.After I restarted it the Hard drive is not detected and my OS dose not load.
Why I believe that it is not a problem of my original computer?
I plugged in another Hard drive and it worked unlike the WD hardware.
Why I believe that the WD hard drive is not dead?
Because it worked on my other computer which had an OS installed but as I said, after I restarted, the my computer dose not load unless I unplug the WD hard drive and reboot again.
Please help me fix this problem and it would be really appreciative and I need to fix the problem Urgently because I have 430GB of programs and documents in it.
PS: I am looking for a mentor.