Last night I was using my lenovo p580 ideapad and it worked fine. About an hour later I went back on it and noticed the keyboard doesnt work anymore. I had to use the on screen keyboard to log into my laptop (password). When I plug an external keyboard, it works fine. Could I have turned it off by accident? All the drivers seem to be up to date. Could there be a virus that turns it off?? I,ve been googling it all morning with no avail.