if you have a mulitmeter then unplug the battery first and see if it has a charge in it , then check if the laptop will come on with only the ac adapter attached , sometimes the battery pack dies and it will not come on whil eits attached to the laptop , the batterys have a life of between 3 to 5 years , sometimes they wont charge or they just fail outright , if the laptop comes on with just the ac adapter then the chances are you just ahve a faulty battery or charging circuit, some laptops have a seperate charge regulator inside , if it does not come on with jus tteh ac adapter then it may well be a sprained power connector , at this point take it to someone who is comftasble with replacing the onboard socket if thats what is loose (obviously check it first ) if your comftable with changing the socket yourself then try and get a strip down manual for the alptop as it will make your chances of messing up much less