Compaq Presario 2500 Power Receptor

I have an old Presario. About a year ago, what I thought was the power cord stopped working. It would only work if it were in the correct position. Finally it just stopped working all together. I thought that it was the power cord, but when I bought a new power cord it did not work either. I believe that it over heated or something. I am not sure what to do. I want to salvage this computer. I do not want to spend a lot of money getting it fixed. Can I buy a new power receptor? I do not even know what it is called. Please help. I know little about fixing computers. Thanks.