“Hello, why isn't the cooling fan on the power adapter spinning, while only the CPU cooling fan is working? Is the power adapter fan faulty? Thank you.”
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Hey liu, If the fan on the PSU isn't spinning while the CPU fan is, this can be common if the PSU has yet to generate a significant amount of heat. If this continues to be the case regardless of the duration of time you're using the system and this is causing you concern, don't hesitate to reach out to Lenovo Support at this number: 877-453-6686, to talk to someone, as we're happy to help. Please feel free to reach out to us with any other questions!
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