My laptop will not power up using the power supply. First, I plug the power supply in the outlet and the indicator light comes on so I know the power supply is working. However, when I plug it into my laptop it is not charging my laptop. Furthermore, when it’s plugged into my laptop the green indicator light goes out like its not charging. I have plugged it into another laptop and it works fine, so the problem has to be with my laptop. Does anyone have an idea as to what is causing this problem? I have a Dell Inspiron 1720.