I'm trying to more accurately diagnose a client's laptop without opening it up, so any help is appreciated. The client says that the battery will not charge and that it needs a new one. Yet when I took out the battery and tried to run the laptop straight off of A/C power, the laptop would not turn on. Tried two different power adapters and neither gave power to the laptop, yet the one that was given to us by the client was lighting up and the other adapter works with other laptops. Even more, the adapter end that goes into the power jack felt loose when plugged in. Therefore, I believe the problem is a loose power jack on the motherboard, but I want to be absolutely sure before I quote the price of a new motherboard to the client. Also, any information about how to repair this problem if it is a MOBO problem would be appreciated as well.