Did the original Lenovo case have a reset button? I ask because not all OEM systems (Dell, HP, Lenovo, etc) have them. A reset button is not essential to the system operating properly.
With the previous provided info, were you able to figured out any of the pins? If so, draw a diagram of the pins you figured out and take a picture of the layout for us to look at. We can make some educated guesses where the reset pins might go.
However, from the diagram above and looking at some system pictures, a reset button may not be supported.