Late '09 27 inch iMac 2 TB HD Replacement (important discovery/remedy!)
Old HD got too full
Everything went as smooth as can be, until...
Upon reconnecting all of the cables to my new 2 TB Enterprise grade HD I discovered that the thermal cable plug on my iMac had 4 slots but only 2 were used, 1 black wire and 1 gray wire. The problem was that I could NOT connect this to my HD because the remaining 2 blank slots had no holes or openings for the pins of the HD to go through. My remedy was to clear out the thin plastic webbing with the same paper clip I used to lift the LED screen out with. See photo. In my opinion, this info MUST be included in the guide. Hope this helps...