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What a number of people have found is the computer has been on for a time and has got rally hot inside. When you turn the computer off the fan continues to spin as the computer is still too hot to work.

If the computer is starting from cold and has not been used for several hours and only the fan works but the rest of the computer stays off then a qualified technician needs to find out why.

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Q: When your computer doesn't turn on but the fan whirs?
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