After reading through others posts I see this is a common problem. Getting the metal tabs over the plastic posts needed the help of a screwdriver. Operating the plastic latch lever requires so much force that I'm convinced that it will break. I have tried rotating the assembly 180 degrees with the same outcome. None of the earlier posts showed a solution except one who got another heatsink/fan. I'm tempted to power this up and see if the cpu temperature is within bounds. Any new ideas?