On power up the Wallpaper Screen appears with time and date on lower LHS and Power and Internet icon on lower RHS. If I click on lower RHS the EASE OF ACCESS icon appears as does the USER icon and PIN box (date and time disappear). But then I cannot enter my PIN because the computer is unresponsive to keyboard entries. Is there an obvious solution to activate the keyboard to allow thee PIN to be entered, or at last resort how do you get into your computer in this situation?