Cmos battery is what keeps your laptop bios as well as the date and time settings.
Lenovo laptop cooling fan not working.
You should see a small circular cmos battery.
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Take it out for 30 seconds and then put it back.
You should place your laptop on a firm level.
How to check if your lenovo laptop fan is working the fan is an integral part of a laptop.
That makes it important to check the working condition of.
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It keeps the internals of your device cooler.
Possible cases of laptop fan not working or spinning 1.
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There is no reason why the fan stops suddenly after a bootup.
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Disconnect laptop power cord if its connected to power source open the back shell of your laptop.
Do not use it on your lap.
While this might not be a cause for alarm on its own when combined with overheating of the cpu it is definitely a red alert.
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In most cases a laptop fan will not work after you boot up the laptop.
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Power on your lenovo laptop and see if this solution fixed your boot issue.
A flat surface is highly recommended.