Macbook Keyboard - Shut down issue

Hi,

I am writing from India. I have a Macbook Mid-2010 model (Unibody).

I am facing an auto shut down issue with it.

The Macbook runs well when i press any key.

Once the key is released, it automatically shuts down at any point, either in boot up or in running state.

I have even formatted the Hard drive and Loaded with OSX Snow Leopard (10.6), which came along with the Macbook.

There is no issue with the Logic board or Hard drive or RAM as the system runs perfect when any key in the keyboard is pressed.

Regards,

Ananth