I would try to disconnect the lithium battery and touchpad from the motherboard:
>>>JackE said:>>>It's FN+F7 to turn it on if BIOS function key behavior is set to normal function key in the Main tab.>>>I don't have an option in BIOS for that.>>>Double-check Bios MAIN tab for function key behavior option. Press Ctrl+S to see if it appears like as shown below for this model.
Then change it from "media key" to "function key" behavior. Then press F10 to save settings and exit the BIOS menu. Then try FN+F7 again to turn touchpad on.
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