Hi, The following output shows periodic output from sensors for my CPU cooler over a short period. The value continually oscillates between a real value (around 720-750 RPM in idle) and out-of-range values 337500 RPM/675000 RPM. When the machine is loaded, and the fan spins faster, the fan value stabilizes at a normal value. The fan 2 sensor has no problems. Anyone have any ideas what's happening? Configuration: lm-sensors v3.01 Motherboard Gigabyte GA-MA78GM-SH2 CPU Cooler: Thermaltake TMGA3 (3 wire) Output from sensors over ~2 mins: it8718-isa-0228 fan1: 726 RPM (min = 0 RPM) fan1: 675000 RPM (min = 0 RPM) fan1: 337500 RPM (min = 0 RPM) fan1: 738 RPM (min = 0 RPM) fan1: 675000 RPM (min = 0 RPM) fan1: 726 RPM (min = 0 RPM) fan1: 675000 RPM (min = 0 RPM) fan1: 337500 RPM (min = 0 RPM) fan1: 675000 RPM (min = 0 RPM) fan1: 725 RPM (min = 0 RPM) fan1: 725 RPM (min = 0 RPM) Many thanks for ideas!