I ordered a 500GB Samsung HDD to upgrade the standard drive in my new Aluminum 2.4GHz Macbook. I used Carbon Copy Cloner to clone the existing drive then shut down and did the switcheroo. After the switch the Macbook won't boot to the new drive - I get a grey screen saying that the Macbook needs to be restarted or shut down. Doing so results in an endless loop displaying the same screen. Any ideas on what might have went wrong or what I should check?? Thanks in advance for the help!!