I bought a macbook pro 13" late 2009 model I believe on ebay and there was a hard drive issue which I thought I can fix....However I came upon some issues..When I put in a new Toshiba 500gb hd in this laptop and reinstall Mac OS X SL I can not find the hard drive in disk utility NOR any other hard drive I put inside on disk utility... What is the problem?? Is it the hard drive cable that I would need to have replaced? Or is it a logic board problem ( which I hope is not as everything else seems to be working...) I did install a new MAC OS X using the 500gb hd on another mac and switched it back into the macbook pro 13" and it did boot up but NOW it just gets blank folder over and over.... Please help! Thank you!