Siva,
Have you tried with a different console cable, different console speeds.
Try reloading the switch and see if you get some output on the screen. Looking at your description makes me believe that there is some hardware problem with the switch. What will be more interseting to see is the output of the switch booting sequence.Look for sone "POST failures ". If you see some of those that means there is some hardware issue with the switch.
HTH,
-amit singh