I bought a new WD 750GB Scorpio Blue and popped it into a 2009 MBP 15". Everything went fine on the hardware side, but when it came time to install the OS on the new drive everything went downhill. Leopard said it couldn't install because something was wrong with the drive. Snow Leopard just never gets past "30 minutes" remaining. I'm not sure what I'm doing wrong, but I'm guessing I have a bad HDD unless I'm somehow missing a step. Both versions of Leopard can see the HDD and can partition it and say that it's OK when I have them check it. I never had much trouble installing Windows, but for some reason installing OSX is eluding me. Any thoughts besides just sending the drive back? I've already disconnected and reconnected it without any improvement.