So i wanted to upgrade my HD from 120-320 in my MBP, bought a HD took it to a major national chain that has as couple "B's" in their name. they first told me they didnt have the tools to swap out the HD, i go back today and they tell me its done. i was skeptic so i turn on the MBP and when it first comes on, where the apple logo would be on the screen it has a circle with a "/" through it instead. what does this mean? i did a copy of the original HD to the new one and even booted up with the HD (via external) before i took it in. so any suggestions/help as to what the problem is?