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I kept wandering why my backlight kept turning off on my Acer 5720. Turned out I had my settings to 'turn brightness to low whenever charger is disconnected' and I had a faulty charger which would disconnect and reconnect randomly but at first I thought it was the backlight that was broken then later found out it was the charger.
Check your brightness settings maybe? Its a longshot but thankfully worked for me.
I also experienced my mousepad stopped working and found a shortcut on the keyboard to deactivate your mousepad then activate it again which worked fine for me.
The shortcut was FN and F7
Again, it is a longshot but give it a go. Hope I helped, although I doubt it.
Check your brightness settings maybe? Its a longshot but thankfully worked for me.
I also experienced my mousepad stopped working and found a shortcut on the keyboard to deactivate your mousepad then activate it again which worked fine for me.
The shortcut was FN and F7
Again, it is a longshot but give it a go. Hope I helped, although I doubt it.