What is controlling the CPU fan speed and where do I start looking to figure out what's killing it? I would like to know more for personal learning than anything. I put a blank 160 GB drive and did clean install of Win 10 Pro 64 bit build 1607 but the problem persists. Fan speed control is restored after a reboot and stays working unless the system goes to sleep. When the CPU is under load, it will heat up and bounce on the thermal throttle. It works ok if the system does not enter sleep since last boot but when the system wakes up from sleep, the fan speed control is disabled and does not respond to CPU temperature. It has a serious problem that prevents the use of sleep. System was shipped with Windows 7 Professional 64 bit and Microsoft upgrade wizard assessed it can upgrade to Windows 10. The fan speed control is tied to CPU temperature. I'm working on a legacy Dell Optiplex 380.
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