Just about every HSF out there has a flaw or two, they're obviously made cheap so that we have to buy new ones but at the prices and sophistication of them these days I think they should be made to last longer than they are. Lost a machine today (meltdown around the CPU) due to the fan blade popping off the Golden Orb. John W told me he has seem this happen a couple of times already. My rant for the day, on the bright side, means I have to tinker with some hardware and that usually means an upgrade 
