Cisco 1750 not showing anything in cli in ...

hi,
my cisco 1750 power up with/without wic cards and no red or amber leds.
it shows power led as green stable and OK led as green and blinking, but am not able to hyperterm into it. The cli is not getting shown at all. I've tried replacing console cable as well as pc and a laptop to use hyperterm.
pls/ suggest how can i reset the same, if theres any error and get into cli.
i've tried pressing ctrl brk n all but nothing is shown in cli.

prakhara@gmail.com - 919928034007