I have a 2006 Intel 13" Macbook and my hard drive just failed (I think). I have the folder-with-exclamation-mark screen going on and a little clicking noise inside the computer. The Apple support guy said it was probably my hard drive. So, I am very limited in funds and was hoping I could replace the hard drive myself. I have replaced its battery and upgraded the RAM... However, I don't have the OS X disc and even if I did, my superdrive has been broken for a long time and I don't have the money for that either... I have access to another Macbook of the same year and I have a USB external hard drive. SO my questions are: Is it possible for me to do this myself? If so how? Or is that a terrible idea? Thank you very much to anybody who can take the time to give me some advice.