If you did not upgrade Mac mini RAM, you may not notice what I saw. Be aware of what I found and unbox in Apple store if you buy Mac mini 2010 in store, and check if you got same batch products I got. Otherwise, genius bar may deny your warranty. I got chance to unbox three new Mac mini 2010 due to machine transfer and replacement. I found two of them have the similar problem. I noticed one of three screws (the smallest one, close to RAM) fixed the fan is stripping out. It cause me to use a third-party software "istat pro" to check hardware, I found only hard disk Tm sensors working, no CPU Tm sensor and other Tm sensor's information. Another Mac Mini 2010 from MacMall has no issues at all. Moreover, the defect Mac mini did has louder noise coming from hard disk and fan than the perfect Mac mini and freeze two time in my 7-day usage (2-3hours/per day). I went to Apple store and got replacing whole unit by a new Mac mini in Apple store yesterday. BUT the new one has the similar problem (same screw stripping and no Tm sensor) out of the box when I tried to update RAM today. Make me feel I should buy a lottery recently. In addition, make me feel unhappy today is the guy in the genius bar suspected me trying to move the screw and tear-town of machine, rather than satisfy customer. BTW, one of three managers I met is rude (I went to the same store three times within two days). If I were what they suspected, I must be very stupid to damage the screw two times (lose warranty) and then go to Apple store trying to replace again. To be honest, I am a backup for department IT support. I know how to tear-town Mac mini 2010 if I want to. I just want to make things right. The genius bar told me they will run a system diagnosis. I got feelings that both defect Mac Mini may come from the same batch of products. It may have more in the market.