Gday got a macbook pro 13" 2009 model, when turning it on it loads as normal, except the load bar is really slow and when it gets to the end it flashes up with a file with a question mark. The hard drive in there is fine, i have tried other hard drives also, and when i put the hard drive in a portable drive case and plug in through USB it loads up perfect, logs into mac osx and runs as it should. i have tried multiple hard drives with different OSX's on it, all work through USB external drive but not when plugged into the sata drive inside. I have also tried a new sata cable but no luck. any suggestions would be great!