My upgrade went pretty well and I'm hoping someone can help me with 1 small issue. After upgrading my 2009 to a 5,1 (12x3.33), CPUA heatsink does not show up in iSTAT or Temperature Monitor, however both CPUs are fine. Of course the fans are on high and I've managed to bring them down using Macs Fan Control. But my biggest concern is that I might have placed the heatsink connector in wrong! Is it possible this could be causing the heatsink to not register? Or do I need a new heatsink? I've already taken it out again and there were no crushed pins. What else could cause the heat sensor to now display and have the fans rev up? Also, how long does one have to leave the Apple Hardware Test running? 1 minute into testing and the program freezes!