Ok, so here is the story: My 15" Macbook Pro's hard drive quit on me. I got a 120 gig SSD to replace it. I put in the hard drive. But whenever it boots up, it only has a grey screen. (It should be a grey screen with the apple logo). After that goes away, it tries to load up like a pc does witht he windows logo and loading bar. Then it freezes because it cant run system 32. Obviously. So my question is, how to i format this drive, so my Mac OSX will run on it. My disc is already in the Mac, I dont know if that helps any at all. All answers are appreciated, i just want my Mac fixed. Thanks for the help!