Why couldn’t my computer change the input method frequently recently?

Why couldn’t my computer change the input method frequently recently?
Was the same a while ago with me.Finally could not cut, did not have the means! Finally only then backup copy, standard plate, rewiring system! Could be good finally! Good luck I before also has bumped into such question, was the software conflict relations, the note disappears may change, if so on software question, you have been useful the wind and snow to record the sign, this east east old version will enable your input method to change CTRL+SHIFT or AIT+SHIFT these 2 kind of cut key