-Have you tried a different cable?
-Is this via USB? If so, maybe try a different port.
-Does the harddrive work but you are not seeing it in Device Manager?
one light is glowing in hard disk, but not able to see any changes in aptop/computer
-Is this harddrive a known good harddrive?
Seagate 1TB HD, I was using for past 6 months.
Thanks in Advance xunicronx.
Also, Is this a H/W prob? How to identify that?