My coworker's laptop (Dell Latitude D510) wont take incoming power from its power supply. I've tried another power cord, same thing. Tried original power cord on another laptop, and it works fine. So, the power cord is out. How likely/possible is it that the actual power receptical on the laptop is dead? If so, how would you go about fixing this? Would it even be practical to fix, or is it one of those things where fixing it costs so damn much you might as well buy a new one?