I just purchased a new MBP 2.2 GHz Core 2 Duo and also bought some upgrades from eBay and decided to do them myself. I know it voids the warranty but it would cost over $1000 for Apple to do it and only $250 for me to do it. I purchased a Samsung 250GB hard drive and installed it. However, I can't install the OS on it. I tried multiple times and it goes nowhere on the install screen. The drive is correctly formatted (trust me I checked probably 10 times). I even installed the OS with no problem on an external USB drive. Then I re-installed the HD again and still the same problem. So I put a different HD in the MBP and it works fine and installed the OS with no problems. Is there something with these Samsung drives that I should know about or something I am doing wrong? I can't figure it out. Please help!