How I replaced my HDD in my 2007 iMac after watching the video on iFixit.
The HDD was imminently going bad by virtue of the S.M.A.R.T. technology built in the drive. Using Disk utility the drive was high lighted in red. Running verify disk passed with flying colors. But when S.M.A.R.T. says its going bad. its only a matter of time.
I printed out the instructions from ifixit's web site, ordered the tool kit, which was processed in no time, everything went smooth with the step by step instructions.
Anyone can do this by just taking there time and following the instructions to the t. I shot two videos, one after I had it apart and the other once it was all put back together. They can be found on youtube. http://www.youtube.com/watch?v=xKspLoQ91...