I just upgraded my mini from Panther 10.3.9 to Tiger 10.4.4 and it seems as if the fan is running constantly and louder now than before. Previously I could only hear the fan if the house was very quiet (late at night for example) but now I hear it all of the time. It is not unbearably loud, but louder all the same. When I first upgraded to Tiger, the mini froze on reboot and gave the beachball no matter what; I couldn't even shut down. I power cycled the mini and it came up (very sluggish until Spotlight finished indexing) and now everything seems OK except for the fan. Have others here experienced this?