I have the same problem. I got my e1505 back early april 06. Problem started appearing the last few months. For me, it happens when the lid is closed and goes to stanby. After a few hours, SOMETIMES the fan goes comes on high and the cpu usage goes high and system slows down. Has now occurred 3 times in last few months. Opening the lid and coming back from standby, then restarting corrects this...til the next time. Seems like a system problem. I think, that the system is setting register bit that controls the fan, to hi. Maybe due to a timing bug or bug in the power mgmt sw settings. This does not appear to be a heat related event, since it has always occurred when the ambient temp is not hot. If you look at the user forum there are a few fan problems, stated around the early april time period. I wonder if it is a lot build problem? It's too bad that you cannot expect a relevant analysis and solution from Dell. The few times I have tried, were not worth the effort. At least I have not had a serious enough problem, so far to keep me from enjoying the e1505.