Currently Being ModeratedMay 6, 2012 1:49 PM (in response to baycwp)
Sometimes after market modules have a slightly thicker blade and require more force to fully seat.
Lay the iMac face down on a soft cloth or towel and try pushing harder on each modules with both thumbs to insure that they are fully seated in the slots.
Then if that does not work, contact Crucial and ask for a replacement set of modules.
Currently Being ModeratedMay 6, 2012 2:25 PM (in response to baycwp)
I bought the RAM that is recommended by Crucial after the scan. As per the order receipt - "
2GB, 200-pin SODIMM Upgrade for a Apple iMac 2.16GHz Intel Core 2 Duo (20-inch) System"
As stated, iMac's can require more force than you expect to correctly seat ram, get a good angle and push firmly, you will feel when you reach the bottom of the slot.
Currently Being ModeratedMay 7, 2012 5:13 PM (in response to Csound1)
Thank you for your replies but I've come to the conclusion that I have installed the memory properly. I have pushed it in until my thumbs are sore and also enlisted two other people to try as well. I can feel them set in, it just doesn't work. I will be contacting crucial.
Currently Being ModeratedMay 7, 2012 5:45 PM (in response to baycwp)
You also might want to recheck your spec's, because I think that you only have a Late 2006.
The only 2.16GHz model made was in late 2006 and it only supports 3GB of RAM. see.> iMac (Late 2006) - Technical Specifications
In 2007 there was only a 2.0GHz and a 2.4GHz model that supported 4GB of RAM. see > iMac (Mid 2007) - Technical Specifications
Adding that a Late 2006 can take a matching 2x2=4GB kit, but will only access 3GB. see > Understanding Intel Mac RAM - Mac Guides
Your best bet is to probably buy a Matching and Tested 2x2=4GB kit from OWC.. see > Apple iMac Memory Upgrades for 17", 20", and 24" Models equipped with Intel Core 2 Duo 1.83GHz, 2.0GHz, 2.16GHz or 2.33GHz
Currently Being ModeratedMay 20, 2012 5:00 PM (in response to den.thed)
For anyone who may have the same problems as me; it turned out that the RAM was defective. I returned the RAM and got two new 2 GB RAM. As soon as I installed the new RAM, they worked properly.