Hi there guys! Im trying to upgrade my Imac with a 16GB kit. I have been reading a lot of troubles to upgrade Imacs to 16Gb, but I dont know if this problem affect to late 2009 or is specific of the mid 2010. Anyone having troubles with a late 2009 upgrades? Also was thinking of going for a Crucial kit of 4x4. Good? Would be much appreciated any consideration. Thanks.