I just upgraded my factory 2.66GHz quad to a W3550 3.066GHz quad. Everything appears to be working great, but have a tiny problem. The 5th screw(far left, furthest from the CPU) on the heat sink won't catch to the motherboard. I've tried clockwise and counter clockwise to no avail. It came loose easily when it was removed. Anyone else have this problem? or a fix? The CPU is running 35-37 degrees with internet and mail open. 43-45 degrees playing a 1080p movie, a 720p movie, and itunes playing a song(all at the same time). I believe those temps are normal.... Thanks!