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Mysterious intermittent trackpad problem in which the trackpad button became more sensitive and then stopped working altogether.

• Plugging in an external mouse, the mouse button was not working either.
• Noticing that the battery icon showed no battery present when a battery was present gave a clue as to the fault.
• Turns out the battery had gassed and was bulging, affecting the trackpad
• After removing the battery (and safely disposing of it), the trackpad button was working fine.

(Contribution by David.)