P/S I am writing through a translator, so I apologize.
There is a key combination to disable touchpad ("UltraNav"). I think it's Fn-F8. Did you not press it accidentally?
I'm not familiar with the X240 but there might be a setting to disable the touchpad in the BIOS, probably somewhere under "Security."
It could be palm rejection kicking in, or some other botched driver settings. Does the touchpad PCI ID show up in Device Manager? Uninstall the device completely (check the box to delete the driver software).
Alternatively, boot into a separate Windows installation. One option is to download and run this off a flash drive: https://www.hirensbootcd.org/usb-booting/
If the touchpad works there, then it's definitely some Windows driver issue.
You might also be able to find help here in Russian: http://forum.ixbt.com/
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And this: http://diy.mironto.sk/thinkpad-x240-rep ... -keyboard/
FYI: some newer X240 have the same clunkpad/touchpad mounting holes as the X250.
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