Hello, recently I've been having several problems with my mid-2009 MacBook Pro; 2 minute beachballs and failure to startup. So I've purchased a new new WD Scorpio Black 750gb thinking it was a HD issue, but after replacing my old HD with the WD, Disk Utility wouldn't recognize the new drive. So I searched around and found out that Hard Drive Cable failure is an issue on this certain MacBook. So I ordered a new Hard Drive cable and just replaced that today, thinking that my new HD would be recognized. However after going into Disk Utility via the OS X Install DVD, my new Hard Drive was still not recognized. So I put back my old stock HD and it was recognized instantly and seems to not have any issues anymore. Could it be that the drive is DoA? Or should I purchase an external enclosure and format my new hard drive that way? I'd appreciate any other suggestions, thanks!