Diagnosis: Updated drivers. Still didn't work. Thought the touchpad cable was unplugged or damaged. But Device Manager sees the device and status is enabled and reports its working. Nowhere in operating system or BIOS shows that the touchpad is "off".
Solution: There's a keyboard toggle command to enable/disable the touchpad. Press Fn + F7 on the keyboard (for Acer Aspire 7750g).
Aside: Fn + F6 is a useful command to turn on/off display. It's better than turning off through the operating system, because this way moving mouse or pressing keys does not turn screen on.
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