Fix a MacBook that is not booting up, test to see if the Hard Drive is at fault or if it is the connector.
In this case the problem turned out to be the hard drive ribbon conector. It is easy to replace and not too expensive.
Usually there is a number printed on the actual cable and it tells you the model number.
starts with a number like "821" followed by a dash and another number and it ends with a dash and an "A".
Here is a link to Amazon where you can look for your particular model within the results OR you can simply input your model number on the search box: http://amzn.to/1KMbP7V
Here is another link to the search for an enclosure at amazon, some people have been asking about the enclosures on the comments so here it is: http://amzn.to/21svcqi
Hope this helps.