Acer Altos R720 Series - Manual (Page 155)

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Check the following:
• Is the power indicator lit? If not, see “Power indicator does not
light.” on page 138 .
• Have any of the fan motors stopped? Use the server management
subsystem to check the fan status.
• Have your fans speeded up in response to an overheating
situation?
• Have your fans speeded up in response to a fan that has failed?