Your post doesn't really make any sense.
But.....
The replacement cables that MS sent out to Xbox owners, does in fact have a "reset" button on it.
However, it isn't a button to reset the Xbox. Think of it more as a circuit breaker. If the Xbox's PSU shorts, it'll pop the "circuit breaker" in the replacement power cable. In order to make it work again, you have to "reset" it by pressing the "reset" button.
....where your hard drive comes into play, I have no idea.