Now I'm being trolled. I spent 30 minutes digging around for compatible RAM to upgrade this thing to 8GB (it has 6 right now). Old config was 2GB in the bottom slot, 4GB in the top. I found a matching Hynix 4GB module of the same exact type and speed as the 4GB stick in there, but this MacBook will not POST with either 4GB stick in the bottom slot. It only posts with the 2GB stick in the bottom slot. 


