Hard Drive was showing problems and was concerned that it could fail at any time, so opted to replace it with a bigger capacity drive.
I knew from the iFixit advice that the drive had to be replaced by a similar brand to the existing HD which turned out to be Seagate, so it took a week before I had the new drive after I had taken the steps to remove the existing drive and ordered my replacement. All went well but I found that some of the pics on the site were not all that detailed when referring to various connectors, for example the thermal HD connector. Apart from this and the lack of a more detailed article on getting back to the restore section of the PC and formatting the new disk all went well. I would have never contemplated trying to fix it myself without the iFixit website and advice. Keep up the great work!