I have several early 2009 iMacs with hard drives that are dead or dying. I was told by a mac specialist there was a problem with the HDDs in this particular model.
Without a hitch! I tore apart the first machine with some trepidation. I've built PCs before, but have always had this feeling that it was taboo to open up a Mac box. After my initial queasiness when the glass came off and the top bezel was lifted I realized, this is a machine like any other - not some mystical medium of Steve Jobs. I've replaced HDD in three machines now and am ready for the next challenge - swapping a logic board from one dead machine to another almost dead machine.
Be meticulous about dismantling. I ordered the magnetic project map and am so glad I did. No screws rolling off the table onto the floor to be kicked into a hidden corner where the Brownies have a chance to make off with my hardware!
1 TB 7200 RPM 3.5" Hard Drive
Heavy-Duty Suction Cups (Pair)
Magnetic Project Mat
Essential Electronics Toolkit