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    The BIOS reset sounds like the BIOS battery died. The BIOS should have an event log; it may say there are checksum errors. (One of my machines when the battery died gives that message.) I'm not sure why the temp reading may be off. Resetting the BIOS to default may fix things. My machine with the dead battery gives me odd symptoms. Commented Oct 23, 2010 at 20:51
  • Here is a wild theory. Check that the MHz of your processor in windows is what it should be. It could be that when the BIOS reset, the default values overclocked your processor! Other than that.. (and this wouldn't explain CPU temp), there can be a setting in the BIOS Q-fan or something i'm not sure,that when enabled, makes the fans only go up when the CPU temp is too high.If it's not enabled, then fan speed is high all the time. When it is enabled,then the fan speed is high when you turn it on but in seconds the fan speed and noise goes down.(may go up again if doing heavy work in windows)
    – barlop
    Commented Oct 23, 2010 at 22:26