I inherited a model 1450 laptop from my son. I would like to hook up a separate keyboard to it. I can see an outlet on the back that I assume is for a keyboard. However there is a plastic plug of some kind in the hole. Can anyone tell me if there is a way to hook an external keyboard up? Doesn't look like the plug is removable. I am assuming this computer is approx 5 yrs old. Thanks for any help