Monitor problem. WHEN I STICH ON THE COMPUTER, MONITOR DISPLAYS CONTRIL LOCK LOCKED AND AFTER SOME

Question

WHEN I STICH ON THE COMPUTER, MONITOR DISPLAYS CONTRIL LOCK LOCKED AND AFTER SOME TIME IT SHOWS CONTROL LOCK UNLOCKED AND THIS DISPLAY CONTINUES ON THE MONITOR. COULD U PLEASE LET ME KNOW AS TO HOW I CAN SOLVE THE PROBLEM ? WHEN I PRESS THE MENU BUTTON THE COMPUTER, IT DOES NOT WORK AND THE EXIST BUTTON ALSO DOES NOT WORK.