>Could anybody tell me how to plug the power cable into the notebook? The power cable is a 2-hole cable as shown in the following picture. (Note: Since I have not used the cable for 2 years, I am not sure if it is the right cable for this notebook.) The rightmost photo was taken back of the notebook.

In addition to Naotos answer:
The power bricks feed the laptop battery with DC , while the "2-hole" typically is AC.
It is quite good that this was not plugged in (besides A and V needs of the notebook).

DC cables are typically single hole, with A and V standardized via diameter to different settings.