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For some reason my Acer chromebook R11’s touchpad has stopped working..could you please tell me how to fix it??? Sincerly, Need help

there may be a foreign object obstructing the clicking mechanism open up the back panel and then remove the battery first. then you should be able to see if there is any debris in the touchpad.

how can I fix my touchpad?

Ensure the device is not in tablet mode as this usually disables the touch pad