My trackpad is not working what is the possible cause

please help me find solution on how to operate again my trackpad because it is not working..

Is your MacBook one with an easily removeable battery? If it is, shut down the MacBook and take the battery out. Connect the MacBook to a power source with its power adapter. Restart the MacBook. Test without the battery installed.
Inspect the battery for any signs of expansion. If any are found, or if the MacBook trackpad works normally without the battery, replace the battery.
Best of luck.

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