The top part of my CM 690 won't secure correctly, I'm not really sure why either. It seems like it's the back 4 clips that won't clip on correctly. As far as I know nothing is obstructing the top from popping on right. Does anyone have any ideas what might be causing this?
i see you have added an extra fan on, so this could be the problem. make sure you throughly check whether anything is preventing you from putting the case top on. if there is nothing then be a bit more forceful. i had similar issues with the very same case in the sense that it was rather stiff to get the pannels off and on