I was upgrading my iMac to 8GB after my crucial 4GB kit arrived and I noticed that it is pretty difficult to install the additional 2 DIMMS. The process itself is straight forward, but pushing in the RAM and having the "click" occur (i.e. ensuring that it is properly seated), requires some force.
And for the wise cracks, yes I made sure that I was installing the RAM int he proper orientation

And for the wise cracks, yes I made sure that I was installing the RAM int he proper orientation