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06-29-2021 08:49 PM
When you power-on the computer, it runs the POST (Power On Self Test).
One of the tasks of the POST is to speed-up the RAM to 100% speed (and 100% noise).
If that task does not complete, the fan-speed stays at 100%, as you have observed.
So, it could be a failure of the motherboard, such that the POST does not start, or does not complete.
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