I am having a problem with my 18 month old dell inspiron 5160 . The warranty already expired. Every time I boot, it displays a message- AC power is not detected and asks to press F1. The AC adptor is just fine. I noticed that the port (DC) is loose. I went throuhg the technical forum on Dell webpage. Its a very common problem in this model. Every body suggested me to change the main board- that costs me about $400$-500. I was wondering if someone gone through this situation has some idea to share on it. Thanks in advance