I built a new system about a month ago with a quad core processor and stock heatsink/fan. The heatsink/fan was a pain to install in the first place (the little push-twist pins didn't want to want to set), I finally got it in and it overheated a little the first day I had it, but was fine until today, and I discovered a couple of the push-twist pins had popped out. I pushed them back in, any suggestions for a better/more permanant fix?