Hi guys. I have a mid 2009 MacBook Pro (the first aluminum body one). It's been staying on the white screen with the apple for hours. A computer guy told me that it's my hard drive that needs to be replaced. I'm really poor right now so I'm replacing it myself- I've never done this nor fixed anything inside my mac before (other than my computer engineering friend opened it once to replace some bad ram). So I'm doing a lot of research so I can do this right, it doesn't seem terribly hard. What kind of hard drive should I use??? I am scared to miss some little detail and that will not be compatible for my macbook. I've read some people having trouble with the hitachi travel star bc they possibly got the wrong version. I am definitely looking for 500GB. 2.5 " I THINK it's a SATA? Let me know if there is anything I should check, or if you have links to suggestions.