late 2009 iMac SSD upgrade
Just did this upgrade on a late 2009 model iMac. I cut up an extra power cable I had laying around for some wire to push in to the heat sensor plug to short it, then wrapped some electrical tape around it so as not to expose any bare wire.
In the bottom right side of the image you can see i tucked this cable under the metal mesh so it doesn't dangle.
I used twist-ties to hold the SSD drive in place instead of getting a 3.5" sleeve. I actually like this solution better than purchasing a 3.5" case because there is more airflow and if you use all 4 twist ties, it will be very stable. I had plenty of space on all sides of the SSD.
This is about the easiest upgrade you can do to an iMac. The only slow down is removing the screen which has 8 screws and 4 plugs to remove so you can get at the hard drive.
Later iMac Modles can be more difficult if your adding a hard drive because you need to remove the logic board as well. This job on the late 2009 will take you less than an hour.
The speed increase is noticeable and is worth it if you need to use a lot of applications that take forever to load for your work. If you just use your computer for movies / mail / web then don't bother, space is more important than hard drive speed in your case.
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iMac by
sirchuck1, on Flickr
this is but my opinion based upon the little that I have been able to piece together about the matter and I may be wrong.
