i had a IP35 Dark Raider about a month ago, and i still have the Scythe Mine, and i picked up my case once and just heard a snap, one of the push pins had just broken.. but because only 1 of them broke it hadn't moved very far, well not far enough to notice anyway.
so i checked everything, couldn't find anything wrong with it.. so i booted it up, got into Windows and everything seemed fine, then abuot 2 minutes later it just powered down!
the heatsink wasn't touching the CPU at all, so the thermal thing on the Intel chip was kicking in and killing the power to the CPU.
your CPU should be fine
it's also a lot easier if you install the heatsink while the motherboard is out of the case.