0% CPU usage - why is the fan running wild on full speed without cpu usage? After restart it still does not stop. After shut down it usually is quite for some hours.Any hint? Thanks.

Hi everybody,I am new to the forum . I have a big problem which I cannot solve myself. Tried many things. No success. Maybe someone can give me a hint what to do?Problem:I have two harddrives conected to the USB ports on th eright side of the laptop ...