I have 6 Lenovo B50 laptops in my care that have all developed a spontaneous keyboard failure.
You can type in the password, but once the desktop is loaded the keyboard does not function. You cannot type and the lights do not alternate when tapping the CapsLock and NumLock keys.
The same occurs if a USB keyboard is attached.
The keyboard works in BIOS, but not in Safe Mode.
They all also recently installed KB3194496, which the internet says may cause keyboard problems. Thank goodness the mouse still works as some people have lost that function as well.
This update seems to be a major one and I'm not sure if its safe to uninstall it, especially as there has been a cumulative update since (KB3194798), which I was hoping would fix the problem but hasn't.
Has anyone had this fault too, or know a way around it?