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I have a similar question - lately my DNS-323 has the fan running when I get up in the morning and obvisouly both HDs are off for the evening. Why does the fan appear to be stuck in the on position? I can reboot the DNS-323 and the fan stays off until the next occurence. The fans on the PC are louder so I don't recognize the thing has the fan on until early am. It used to shut the fan off (if it ever even ran).