Simultaniously my keyboard backlight, touchpoint and trackpad stopped working. They do not appear in device manager and reinstalling drivers did nothing.

On Lenovos advice, I purchased replacement palmrest, trackpad, keyboard etc and fitted them successfully but this has made no difference.

Could it be a power management issue? I've updated PM drivers. Motherboard damage? As far as I know no water or physical damage has occurred.

Also I've done various system restores and reinstalled Windows 8.1